E762/E765/E768 Retro Tube Operator´s Manual
E762/E765/E768Retro Tube
Operator´s Manual
Table of Contentspage
IntroductionFeatures and Functionality at a Glancespecial notes, ContentsFront Panel Features:
Rear Panel Features:
TroubleshootingTechnical Data,Tube Map, Tube Exchange Service
Wiring of Principal Connectors
Note:
:
Handling and Care
Preamp section: Input, Channel 1 - Control FeaturesPreamp section: Channel 2 - Control FeaturesGain Boost, Channel 1< >2 selectionPower Amp section: Master A and Master A/B feature, Stand By
(P.T.F.)
(P.T.F.)Noise Gate: Threshold LevelFX Loop: Send, Return, and BalancePower Amp section: Power Tube Fuse (P.T.F.)Power Amp section: Poweramp Output 4, 8 16 OhmsPoweramp Output: speaker options
Power switch
Mains connector (AC Power Inlet), Mains FuseAmp remote control: S.A.C. Port for Z-9, Footswitch Ports
Detailed Specifications and Ratings
You'll find an ancillary pamphlet accompanying this owner's manual entitledInstructions for the Prevention of Fire, Electrical Shock and Injury.Be sure to read it before you plug in and power up the amp!
Technical specifications are subject to change without notice.
Power Amp section: Power Tube FusePower Amp section: Master B controlPower Amp section: Power Tube Fuse LED
Remote Control Options
Configuration table for Z-9 settingsMounting Instructions: front panel frame
CAUTION! Please read and heed the following:
456
6, 78, 999, 1010
1111, 12131313, 1414, 151515, 161616
1718, 19202122222324 - 26
3
Congratulations and thank you for choosing the ENGL Retro Tube amp!It's all in the name: The Retro Tube line is a new generation of ENGL amps that dips intoa deep well of classic sounds. Plug in and you will be able to pull up the typical tones ofthe iconic guitar heroes who wrote the book on rock. Offering four different gainstages in two channels and brimming with trademark ENGL features, the Retro Tubeoffers a vast range of spine-tingling tones. The amp's visuals are certainly striking andstylish enough as it is, but the interchangeable front-panel frames add an entirely newtwist. The different colors let you tweak the Retro Tube amp's look to taste.Painstakingly selected EL34 power tubes underscore the amp's retro flavors andprovide all the juice you need to dial up the sound pressure.Preamp Channel 1 is tuned to deliver warm, organic clean sounds that break upbeautifully when you dial in higher gain levels. A twist of the wrist is all it takes toconjure luscious harmonic overdrive .This channel's Gain Boost option not only increases amplitude, it also adapts frequencyresponse to create a unique tonal structure perfect for sweet chord progressions andsanctified rock riffs.Channel 2 extends the amp's tonal spectrum with two far more aggressive gainstructures than Channel 1. It does everything you want it to do when it comes tooverdrive, saturation and all-out distortion: the Gain Boost option inserts an additionaltriode tube into the signal path to create an extremely thick sound structure with daysof sustain and a rich overtone spectrum perfect for soaring leads.The built-in Noise Gate helps stifle the annoying hiss often generated when Gain Boostis engaged at very high gain levels. Channel 2's Tone button fattens up the sound inboth Gain stages. It enriches the midrange frequencies, effectively doubling thenumber of basic sounds available to you in Channel 2.Footswitches let you conveniently access the various setups so can mix it up for rhythmand leads on the fly.Other trademark ENGL features include a second master volume (Master A/B), apower tube protection circuit with an LED display (P.T.F.), and an adjustable,switchable FX loop (parallel/ serial).There are few more handy features to rave about: The Retro Tube amp sports ourSerial Amp Control Port, or S.A.C. Port for short.Plug an ENGL Z-9 Custom Foot Controller into to it and get hip to some very convenientremote control options. This footboard lets you activate the two channels directly incombination with Gain Boost and Master A/B switching simply by tapping its fourfootswitches. And that affords you instant access to four sound variations at twodifferent volume levels each. Moreover you can access further prominent features like
and ; the build in Noise Gate is switchable via footswitch too.In addition, the amp comes with three stereo jacks designed to accept dualfootswitches like the ENGL Z-4 or a MIDI switching system (e.g. ENGL Z-11) forselecting the channels and other crucial Amp features.Old world craftsmanship and highest quality components are part of what makesENGL amps so special, and the Retro Tube Amp is no exception. On that note, pleaseread and heed the guidelines on handling all-tube amps. The ENGL team is convincedthat this amp will delight and inspire you.
Tone FX Loop off/on
4
Your ENGL Retro Tube Amp puts at your disposal:
Features and Functionality at a Glance
1. a logical control feature array, utmost and;
2. and with two channelsand different voicings. Channel 1 features a Bright sound switch; Channel 2features the Tone sound option for a precise sound tuning of mid frequencies.
3. : s are at yourfingertips, and a tap of your foot on the conveniently compact footboard.This gives you very .
5. An that will give you years ofand .
-> : withseparate Gain and Volume knobs.
-> . You can control the remotely viaa footswitch and use this circuit as a hardware bypass for connected FX.
ease of use remarkably intuitivehandlingTop-shelf sound-shaping options remarkable versatility
A broad tonal palette urgically precise sound-sculpting functions
powerful remote control options
ultra-advanced, tone-generating machineplaying pleasure value to boot
Two channels
Switchable and adjustable
-> assigned to; button assigned to .
-> . You can footswitch these knobs to activatetwo different power amp volume settings on the fly without twisting a knob.
It lets you select the two channels incombination with , thereby affording you direct access to four gainstages, and the means to control two additional (sound-shaping) features ofyour choice. Three ¼" (6.3 mm) stereo jack plugs accept three dual footswitchesthat let you remotely control the two channels; , , ,
(off/on), and the (off/on).-> Activate it at the amp or via
footswitch to suppress excessive noise at very high gain settings.
Among the hallmarks of this fine amp are painstaking workmanship and finishing aswell as rigorously tested and carefully selected quality components. You'll findguidelines on care and maintenance of tube amps on page 17. Under the heading Tipsfrom the designer, you'll come across practical tips on the aforementioned featuresthroughout the manual. All critical information concerning the operation of this amp
Two sound switching options in the preamp section:
Two power amp Master knobs
-> The optional Z-9 Custom Footswitch.
A Noise Gate for the Channel 2 with Gain boosted.
BrightChannel 1 Tone Channel 2
Gain Boost
Gain Boost Tone Master A/BFX Loop Noise Gate
FX Loop FX Loop
4.
Channel 1: Clean to subtle overdriveChannels 1 & Gain Boost: Crunch with a touch of preamp overdriveChannel 2 – From crunch to lead with the gain bumped upChannels 2 & Gain Boost: For lead sounds with lots of sustainand high gain reserves
and , each channel
-> : One three-band EQfor and one three-band EQ for .
Four excellent fundamental sounds boasting the finest qualityin tube-driven tone:
Two voicing sections specially tuned for each channel
Channel 1 Channel 2
Channel 1 Channel 2
5
is preceded by "NOTE", "CAUTION", "Read and heed" or some other eye-catchingcomment. We're calling your attention to these remarks for reasons of safety or othercompelling motives, so please give them due consideration.Everyone at ENGL is confident that theand are sure to delight you:
Though this amplifier is relatively easy to handle and you're probably raring to give it ago, I recommend that you read the owner's manual thoroughly before you power itup. It is equipped with several safety features that require further explanation toprevent malfunctions.
1. ENGL Retro Tube Amp Head type E765 - 100 watts or type E762 - 50 watts;2. mains cord;3. this manual;4. Two interchangeable front panel frames, one in red and the
other in yellow5. a pamphlet entitled
.
At the back of the manual, diagrams of the front and rearpanels. As you're the descriptions of the amp's features, you'll gain a betterunderstanding of the topic of discussion if you unfold and refer to them as we go!
¼" unbalanced input jack. Plug your guitar in here using a shielded cord.
Depending on the type of cord and its shielding, you may occasionally encounterinterference from sources such as radio stations or powerful magnetic fields. Whenthis occurs, try connecting your guitar to the amp using different cords. What's more,to minimize signal degradation due to high-frequency loss, use the shortest cordsfeasible (as a rule, the shorter the cord, the less susceptible it is to high-frequencyattenuation).
The Channel 1 Gain control knob determines the preamp's input sensitivity andamplitude when Channel 1 is active.
Here's how this knob's settings relate to the type of guitar pickup. If you are usingsingle-coils, the preamp will start breaking up at about 6, and at around 4 or 5 withmore powerful humbuckers or an active pickup.If you want a pristine clean sound, back off the Channel 1 Gain knob setting and switchoff Gain Boost (14).
Retro Tube amp's extraordinary versatilityoutstanding features Simply plug in, play and be inspired
by the tone of your new great ENGL Amp!A few words of wisdom from the designer:
A tip from the designer:
A tip from the designer:
Contents:
Instructions for the Prevention of Fire,Electrical Shock and Injury
Front Panel Features
("Rocking Red")("Vintage Vanilla") and mounting material (page 24);
you'll find fold-outreading
1 Input
2 Gain Channel 1
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If you want just a touch of preamp overdrive, I recommend the following settings forsingle-coil pickups: Set the Gain knob between 7 and 10 and deactivate Gain Boost. Forhumbuckers, set the knob between 5 and 8 to get moderate overdrive.Then when you need a grittier tone perfect for playing rock riffs, all you have to do isactivate the Gain Boost in Channel 1.This particular sound-shaping option (Channel 1 - Gain Boost activated) is comparableto plugging an overdrive pedal into the amp's front end. This not only boosts the gainlevel, it also re-voices the internal filter stages to boost the low mids and conjure amore assertive tone.
Extremely high gain and volume levels can produce powerful feedback.Avoid feedback squeals; they can lead to hearing loss and damage speakers! At highervolumes, back off the Gain and Treble levels in order to prevent unchecked feedback!
This feature boosts the upper end of the high frequency range for Channel 1. Itsintensity decreases as gain settings increase.
For a crisp or glassy tone, activate the Bright boost. It brightens the sound ofhumbucking or muddy pickups. Use it to tweak the amp's tone to taste, activating it toboost top-end frequencies or deactivating it to dampen high end response.
This is the preamp voicing section's passive low-frequency EQ for
This is the preamp voicing section's passive midrange frequency EQ
This is the preamp voicing section's passive high-frequency EQ
The best way to get to know the amp and its fundamental sounds is to start out bysetting all tone knobs to the center position (: 5). These are passive tone controlsselected and tuned specifically for the whole retro concept, so their control ranges arenarrower than those of active EQs.
CAUTION:
A tip from the designer:
A tip from the designer:
7 Volume Channel 1
3 Bright
4 Bass
5 Middle
6 Treble
A Tip and Some Important Info from the Designer:
Channel 1.
for Channel 1.
for Channel 1.
Determines the level of Channel 1. Twist this knob to adjust Channel 1's volume anddial in the desired balance of levels with Channel 2. Because this volume control islocated pre effects loop, it also determines the effects send level for Channel 1.
The inputs of modern effect devices can handle signal levels up to +10 dB, so it's a goodidea to dial up a higher send level for the FX loop. Do this by turning up the Channel 1(7) and Channel 2 (13) preamp Volume knobs. Dial in settings higher than 5 to makethe most of the dynamic range between the preamp and power amp.Once you have matched the preamp and effects device level, use the Master knob (16)to adjust the amp's overall volume. If you insert older stomp-boxes devices into the
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RetroTube amp's FX loop, you can reduce the level at the FX Loop Send jack (30) tosomewhere between -20 dB and -10 dB by setting the two channel Volume knobsbetween 1 and 4. Older effects pedals usually don't handle high input levels well. Evena -10 dB signal can cause undesirable distortion.
Gain control for the Channel 2. This Control knob determines input sensitivity whenChannel 2 is active. Use it to dial in the desired amount of preamp saturation level.
Preamp Channel 2 is a lot hotter than Channel 1 because its baseline gain level is a lothigher. It is roughly comparable to that of Channel 1 with Gain Boost activated.However, its tonal structure is different, giving you yet another flavor of overdriventone to spice up your musical act.Activating Gain Boost sends Channel 2 into very different sonic territory withsustaining lead tone that is great for soloing.If you push Channel 2 hard while Gain Boost is active, the preamp gain will besubstantial and noise such as hissing and any buzzing produced by guitar pickups willbe amplified considerably. If you wish to configure the preamp so that both Channel 2and Gain Boost are on, you can activate the Noise Gate (see section 29) to largelysuppress such noise.
Extremely high gain and volume levels in Lead mode can produce powerfulfeedback. Avoid feedback squeals; they can lead to hearing loss and damagespeakers! At higher volumes, back off the Gain and Treble levels in order to preventunchecked feedback!
This sound-shaping button mainly influences the upper midrange. When activated, itboosts the frequency range between 500 Hz and 1 KHz.
For more details see the chapter 21 and 23 on page 11 and 12 !
The Tone button voices specific midrange frequencies that are instrumental in fine-tuning a guitar's sound. The amp's sound will be thicker when it is activated.If you want a less dominant midrange, leave this feature deactivated; that is, don'tpush this button. The Tone button also lets you adapt Channel 2's fundamental soundto suit different types of guitar pickups.
8 Gain Channel 2
A tip from the designer:
CAUTION:
9 Tone
A Tip from the Designer:
10 Bass
11 Middle
12 Treble
ToneThe LED above the button lights up to indicate is activated.The Tone sound feature may also be switched using a Z-9 Custom Footswitchconnected to the S.A.C. Port (21) or a footswitch connected to jack (23).
This is the preamp voicing section's passive low-frequency EQ for Channel 2.
This is the preamp voicing section's passive midrange EQ for Channel 2.
This is the preamp voicing section's passive high-frequency EQ for Channel 2.
8
A tip from the designer:
13 Volume Channel 2
To help you get acquainted with the amp's fundamental sounds, I recommend thatyou set all tone controls to the center position; that is, to around 5. For higher-gain,high-volume lead sounds, your best bet is to turn the Treble knob down to prevent thepickups and speakers from generating undesirable feedback. I'd recommend a settingbelow 5.Though this passive voicing section's control range is narrower than that of acomparable active system, its EQ curve is tweaked specifically for its designatedpurpose and will give you satisfying results, so you have heaps of voicing options fortailoring retro sounds to taste.
Master A volume knob. Located post FX Loop, it adjusts the power amp's output level.Master A is enabled and its setting determines the master level if you have notconnected a footswitch to the amp. If you have connected a footswitch you can use itto activate another master level as determined by the Master B (27) knob setting.
Determines the level of Channel 2. Twist this knob to adjust Channel 2's volume anddial in the desired balance of levels with Channel 1. Because this volume control islocated pre effects loop, it also determines the effects send level for Channel 2.
see the chapter 7 on page 7!
Press this button to increases the amplitude in Channel 1 and Channel 2 considerably.The yellow LED above the button lights up to indicate is active. The button(14) on the amp's front panel is disengaged when you switch via footswitch(21, 24). may also be switched via an ENGL Z-9 Custom Footswitchconnected to the S.A.C. Port (21) or via a footswitch connected to jack 24. For moredetails, see chapters 21 and 24 on page 11 and 12 !
Activating Gain Boost in Channel 1 increases the gain level significantly, enough to pushthe preamp into overdrive. This brings out and tightens up the middle frequencies toconjure a more assertive sound for classic-style rhythm workouts. Activating Gain Boostin Channel 2 kicks up the gain level considerably, saturating the preamp to give you farmore sustain and much thicker tone. This means you can coax blazing lead tone out ofthe amp without having to connect an outboard gain enhancer or overdrive pedal. Andthe sound qualitymaywell sendyour stomp-boxes into retirement.
This channel switching button selects Channel 1 or Channel 2. Press it to activateChannel 2. The red LED above the button lights up to indicate is active.Channels may also be switched via the ENGL Z-9 Custom Footswitch connected to theS.A.C. Port (21) or via a footswitch connected to jack 24. For even greater convenience,you could also use the optional ENGL Z-9 Custom Footswitch to select the two channelsin combination with the two Gain Boost stages directly by simply tapping the Z-9's fourchannel-switching buttons. Formoredetails, see chapters 21and 24on page11 and12!
A tip and important info from the designer:
14 Gain Boost
A tip from the designer:
15Channel 1<>2
16MasterA
Gain BoostGain Boost
Gain Boost
Channel 2
9
A tip from the designer:
17 Stand By
A tip from the designer:
18 Power
CAUTION: After an extended period of operation and higher ambient temperaturesthe amps's chassis can become very hot, therefore avoid touching the rear panelsurface !
You could use an ENGL Z-9 foot controller, for example, to remotely control Master A,the default when you are not using a footswitch, and Master B, which is only accessiblevia footswitch. Then you could dial in different levels for Master A and Master B andcombine these with the amp's various modes – very practical for shaping tone andcontrolling volume on the fly at gigs. Note that the four channel switches on the ENGLZ-9 foot controller let you access Channel 1 and Channel 2, and each directly incombination with Gain Boost and Master A/B modes. This gives you a range ofalternatives that you can apply to different playing styles and situations to greatdramatic effect, for instance, to play rhythm and more restrained leads over Channel 1and then kick up the preamp gain for playing high-octane rock riffs and leads overChannel 2.Beyond that, you can also broaden the volume and tonal ranges by working yourguitars' volume knob. If your arsenal includes MIDI gear - for instance, the Z-11 ENGLMIDI Switcher in combination with the Z-9 Custom Footswitch - you can use the MasterA/B switching function to call up different volume levels for the various preampsetups.
Power amp standby switch: Use this switch to silence (0 position) the amp when youtake longer break. The amp's tubes stay nice and toasty, and the amp is ready to rollimmediately when you ramp it back up to full power.
I suggest you get into the habit of using standby during short breaks. In this mode,current is not piped through the power tubes, so they don't get as hot (due to the lackof anode dissipation) and are spared considerable wear. The amp is ready to run whenyou flip the Standby switch because the tubes are already warm and don't require timeto heat up. For breaks of 30 minutes and longer, I recommend that you switch the ampoff in order to conserve energy.
Mains power on/off.ensure that the Stand By switch (17) is set to (0 position) before
you switch the amp on. Let the tubes heat up for about 30 seconds before you activatethe power amp. This procedure spares the tubes.
Stand ByPlease note:
10
Rear Panel FeaturesAt the back of the manual you'll find a folded page offering diagrams of the front andrear panels. Please unfold and refer to it as you read through the descriptions offeatures and functions!
Plug the mains cord in here. For European models, use a standard non-heatingequipment connector cable.
alongside
The rear chamber contains the mains fuse and in the front chamber, a spare fuse.
To learn if a given feature may be controlled remotely, refer to its description herein.You'll find a configuration table showing the Retro Tube Amp's functions on page 23.The ENGL Z-9 Custom Footswitch is optional.
Plugging a jack plug into the S.A.C. Port disables the Gain Boost and theChannel switching functions controlled by the buttons (14, 15) arrayed on the amp'sfront panel. What's more, it also disables the footswitch jacks' (24) remote-controlcapability. In other words, when a Z-9 board is plugged in, it has priority over the amp'sGain Boost and Channel switching controls as well as Gain Boost and Channelswitching via a footswitch connected to jack (24).
Never link two S.A.C. Ports of Engl amps via an Y-adaptor to a Z-9 CustomFootswitch; this can cause ground hummming noise and damage the internal circuits!
Try out the ENGL Z-9 Custom Footswitch - chances are you'll love the remote-controlconvenience for your RetroTube amp. Based on a rather clever switching concept, it
Mains Connector (
CAUTION: Make sure you use an intact mains line cord with a grounded plug!Before you power the amp up, ensure the voltage value printed the mainssocket is the same as the current of the local power supply or wall outlet.Please also heed the guidelines set forth in the separately included pamphlet,
.
20 Mains Fuse Box:
CAUTION: ALWAYS make sure replacement fuses are of the same type and have thesame ratings as the original fuse! Please refer to the fuse ratings table.
21 Footswitch: Serial Amp Control Port (S.A.C.)
Heads up:
CAUTION: Connect only the ENGL Z-9to this 6.3 mm (¼") stereo jack! Connecting any other
switching device may damage it and/or the amp's circuitry!Insert and remove the Z-9's cable to and from the S.A.C. Port only when the amp isswitched off!Please note:
A tip from the designer:
Instructions for the Prevention of Fire, Electrical Shock and Injury
19 AC Power Inlet; IEC - C14 connector)
This serial data input serves to control six of the amp's switching functions remotely. Itaccepts the optional ENGL Z-9 Custom Footswitch as well as the optional ENGL Z11-S.A.C. MIDI Switcher for use as a MIDI interface. Use a cord equipped with stereo 6.3mm (¼") jack plugs to connect this input to the S.A.C. Out on the Z-9 Footswitch or Z11-S.A.C. MIDI Switcher. The custom-designed Z-9 and the MIDI Switcher (in MIDIinterface mode) let you switch every amp feature designated as footswitchable in thismanual. You can configure the Z-9 Footswitch to control
and and two further features directly.Master A/B
or the ENGL Z11-S.A.C. MIDISwitcher (S.A.C. Out)
the two channels incombination with Gain Boost
Footswitch
11
features four switches that afford you direct access to Channel 1 and Channel 2 incombination with the two Gain Boost stages.Alongside selecting channels, you can opt to control any other two switchable ampfunctions such as and or and , and so forth.
to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw orSPST for short). This type of footswitch lets you access
One of the two switches enables or bypasses , while the other switchesthe Noise Gate on and off (Channel 2 with Gain Boost engaged only).Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal controls
, while the stereo terminal controls on (for pin assignments, seepage 22).
Plugging a footswitch into this jackdisables onboard (9) switching.Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal selects ,while the stereo terminal controls the Tone feature (for pin assignments, see page 22).
to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw or
Tone Master A/B FX Loop Noise Gate
Noise Gate
Tone
22 Footswitch: FX Loop, Noise Gate Off - On
23 Footswitch: Master A/B, Tone
24 Footswitch: Channel 1 < > 2, Gain Boost
Another tremendous benefit of this microcontroller-driven footboard is that itconnects to the amp via an easily obtained, standard stereo cord. But that's not the lastof the Z-9's advantages: At some point, you may decide to ramp up or connect to aMIDI system using the ENGL Z11-S.A.C. MIDI Switcher. This won't render the Z-9obsolete because it also serves as a simple MIDI footboard with a MIDI OUT (5-pin DINconnector) that selects 10 MIDI patches (or presets, if you prefer). Again, I want toemphasize that you should never connect another footboard to this jack: The Z-9 andthe Z11-S.A.C. control the amp via a proprietary ENGL serial data protocol, and theSerial Amp Control Port was developed exclusively for ENGL amps. No other footboardwill work and in fact is likely to damage the footboard or the amp's circuitry!You can use the ENGL Z11-S.A.C. MIDI Switcher to integrate the amp straight into aMIDI system. You can also opt to control two amps in parallel using the Z11-S.A.C.MIDI Switcher and MIDI commands. The Z11-S.A.C. Switcher is equipped with sixswitching loops (accessed via three stereo jacks) and the S.A.C. Out (stereo jack) forprecisely this purpose!
Use this ¼" (6.3 mm) stereo jack
on/off andon/off.
on/off /off
Use this ¼" (6.3 mm) stereo jack to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw orSPST for short). This type of footswitch lets you access and . One ofthe two switches activates Master A or B, while the other selects the Tone control,which boosts Channel 2's midrange frequencies.
Use this ¼" (6.3 mm) stereo jack
FX Loop Noise GateFX Loop
FX Loop
Master A/B Tone
Master A/B
12
SPST for short). This type of footswitch lets you access the two channels and Gain Boostoff/on. One of the two switches activates or ; the other engages
. Plugging a footswitch into this jack disables onboard channel (15)switching and (14).Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal selects Channel 1 orChannel 2, while the stereo terminal controls the Gain Boost feature (for pinassignments, see page 22).
A fuse in the rear chamber of this fuse drawer protects the V8 (Retro Tube 50: V6)power tube. It is designed to blow in the event of an electrical problem with tube V8(Retro Tube 50: V6). The Power Tube Fuse LED (28) lights up to indicate that one orseveral of the four fuses has blown. There is a replacement fuse in the front chamber ofthe fuse drawer.
Always make sure replacement fuses are of the same type andhave the same ratings as the original fuse! See section 28 for some more key factsabout tube defects.
A fuse in the rear chamber of this fuse drawer protects the V7 (Retro Tube 100) powertube. It is designed to blow in the event of an electrical problem with tube V7 (RetroTube 100). The Power Tube Fuse LED (28) lights up to indicate that one or several ofthe four fuses has blown. There is a replacement fuse in the front chamber of the fusedrawer.
Always make sure replacement fuses are of the same type andhave the same ratings as the original fuse! See section 28 for some more key factsabout tube defects.
Master B volume knob. Located post FX Loop, it gives you an alternative to the MasterA knob (16). In another words, you can set a different power amp output level andthen activate this Master B volume via footswitch. If you wish to switch betweenMaster A and Master B, you have to connect an ENGL Z-9 Custom Foot Controller tothe S.A.C. Port (21) or footswitch such as the ENGL to jack no. 23. Two options forcontrolling Master A/B via the Z-9 are described on page 10. You'll find tips on how tomake the most of Master A/B switching in section 16 on page 9 & 10.
This LED lights up to indicate one of the fuses in the fuse drawer (see the descriptionsunder 25, 26, 33, 34) has blown to protect the power tubes.
Channel 1 Channel 2Gain Boost
Gain Boost
25 Power Tube V8 Fuse (Retro Tube 50 Amp - E762: Power Tube V6 Fuse )
CAUTION: Switching off the amp and pull the mains plug before opening the fusedrawer!Need-to-know info:
26 Power Tube V7 Fuse (Retro Tube 100 Amp - E765)
CAUTION: Switching off the amp and pull the mains plug before opening the fusedrawer!Need-to-know info:
28 Power Tube Fuse LED
27 Master B
13
Need-to-know info:
29 Noise Gate Threshold Level
A tip from the designer:
IMPORTANT note; please read and heed
As a rule, it is an electrical problem with the tube that causes apower tube fuse to blow. Normally this power tube is defective and needs to beswapped for a new tube. The best way to tell if the defect is permanent is to replacethe fuse before installing a new power tube.The tube map on page xx shows the positions of the power tubes. The RetroTube 100is equipped with four fuses for the V5, V6, V7 and V8 power tubes; the RetroTube 50requires just two fuses for the two V5 and V6 power tubes. With a replacement fuse inevery fuse drawer, there are plenty of backups on board.
This control activates an onboard Noise Gate serving to suppress any excess noisegenerated when both Channel 2 and Gain Boost are active. To this end, twist the knobclockwise, near or just beyond the 9 or 10 o'clock position.In addition the Noise Gate can be controlled remotely (on/off) via a footswitchconnected to jack 22 (for details refer to chapter 22) or via the ENGL CustomFootswitch Z-9 (refer to chapter 21 for details). If you want to control the Noise Gateremotely via footswitch, you must set the Threshold knob to 10 o'clock or beyond.Use this knob to set a threshold value (that is, the noise level) at which the Noise Gateactivates to suppress the signal within the 9 to 5 o'clock range. The further you twistthe knob to the right, the higher the signal level at which the Noise Gate kicks in. If youset the knob to the 5 o'clock position, the Noise Gate reacts to extremely high noiselevels, meaning that there's not much of a margin between the guitar signal andbackground noise.
Noise is a definite no-no in many situations. For example, studio etiquette demandsthat you keep a lid on extraneous noise during short breaks. It's in the nature of high-gain rigs to generate undesirable peripheral noise in overdriven (high gain) channels.This is attributable to the physical properties of an amp's constituent components, inparticular its active components. That's right; those cherished tubes are the culprits.The Noise Gate is a tool that lets you silence this noise during breaks by way of signalmute circuit. Note that electric guitars pick up interference signals, and these areamplified tremendously at high gain levels (Channel 2 with Gain boosted). The mostcommon source of noise is 50 Hz or 60 Hz (hertz/cycle) mains hum, particularly whenthe guitar is positioned near transformers and power units. Because in worst-casescenarios this humming can attain extremely high levels, the Noise Gate can hardlydistinguish between the musical signal and noise. This makes it hard to find the rightThreshold setting. It is entirely possible for this humming and other noise to rise to alevel that deactivates the Noise Gate and therefore becomes audible. My advice is tostay as far away from transformers and power units as space allows.
: The may open up inadvertentlywhen the is activated, a high-gain Lead channel is selected, and the volumeexceeds the Threshold knob setting. At very high volume and gain settings, this maygenerate instant feedback, particularly if your guitar is facing the speakers. Ratherthan musical and controlled, this is the shrill, unpleasant and potentially harmfulvariety of feedback squealing that sends your audience and fellow musicians packing.Though the amp is not more susceptible to feedback when the is activated,
Noise GateNoise Gate
Noise Gate
14
the fact that it suppresses extraneous noise means you can't hear those telltale signsthat feedback is swelling and consequently can't take measures to suppress it. For thisreason, make an extra effort to be careful when the is activated: Beforeyou approach the amp and speaker cabinet with your guitar in hand, turn the guitar'svolume knob to the far left position (to 0 so that no signal is audible) to prevent thepickups and speakers from interacting!
Connect to a signal processor's input/return jack using the shortestpossible shielded cord equipped with 1/4" plugs. The FX Loop can be controlledremotely (: on/off) via a footswitch connected to jack 22 (for details refer to chapter22) or via the ENGL Custom Footswitch Z-9 (refer to chapter 21 for details). In thesignal path, the located post preamp and pre the two power amp Masterknobs.NOTE: The FX Loop Send output is removed from the preamp signal path when the FXLoop is deactivated.
Connect the input to a signal processor's output/send jack using the shortestpossible shielded cord equipped with 1/4" plugs. The FX Loop can be controlledremotely (: on/off) via a footswitch connected to jack 22 (for details refer to chapter22) or via the ENGL Custom Footswitch Z-9 (refer to chapter 21 for details). In thesignal path, located post preamp and pre the two power amp Masterknobs.
FX mix control for the . When the knob is set to , the amp signal is routedthrough with no processed signal (0% wet balance) added to the mix. Twist the knobclockwise to blend in the processed signal (parallel/passive, wet balance 1-99%,depending on knob position). When the knob arrives at the Effect position, only thewet signal (that is, the processed signal generated by the connected effect device) ispatched to the power amp (serial, 100% wet).
Set this knob to when this loop is not in use! S
A fuse in the rear chamber of this fuse drawer protects the V5 power tube. It isdesigned to blow in the event of an electrical problem with tube V5. The Power TubeFuse LED (28) lights up to indicate that one or several of the four fuses has blown.There is a replacement fuse in the front chamber of the fuse drawer.
Always make sure replacement fuses are of the same type andhave the same ratings as the original fuse! See section 28 for some more key factsabout tube defects.
Noise Gate
FX Loop Dry
Dry
30 FX Loop Send
31 FX Loop Return
32 FX Loop Balance
NOTE:
33 Power Tube V5 Fuse
CAUTION: Switching off the amp and pull the mains plug before opening the fusedrawer!Need-to-know info:
the FX Loop output
FX Loop is
FX Loop
FX Loop is
NOTE: The effect signal at the FX Loop Return input is removed from the signal pathwhen the FX Loop is deactivated.
ettings between the 9 and 3o'clock position reduce the signal level.
15
34 Power Tube V6 Fuse (Retro Tube 100 Amp - E765)
CAUTION: Switching off the amp and pull the mains plug before opening the fusedrawer!Need-to-know info:
35, 36 Poweramp Output, 4 Ohms Parallel
37, 38 Poweramp Output, 8 Ohms Parallel
39 Poweramp Output, 16 Ohms
IMPORTANT NOTE, please read and heed:
Cabinet options
A fuse in the rear chamber of this fuse drawer protects the V6 (Retro Tube 100) powertube. It is designed to blow in the event of an electrical problem with tube V6 (RetroTube 100). The Power Tube Fuse LED (28) lights up to indicate that one or several ofthe four fuses has blown. There is a replacement fuse in the front chamber of the fusedrawer.
Always make sure replacement fuses are of the same type andhave the same ratings as the original fuse! See section 28 for some more key factsabout tube defects.
4 ohms speaker output jacks, internal connected parallel. For diverse cabinet options!
8 ohms speaker output jacks, internal connected parallel. For diverse cabinet options!
16 ohms speaker output jack. For diverse cabinet options!
Never operate the power amp without asufficient load, otherwise you may damage or destroy it! Always check the connectedcabinets' impedance to confirm it matches the amp's output impedance! For example,if you are connecting a cabinet to one of the two 8-ohms output, make sure thespeaker system is indeed rated for 8 ohms. You'll find the various speaker and cabinetoptions listed in the nest section. I cannot stress enough the importance of properimpedance matching when connecting one or more cabinets to your amp. Impedancemismatching can damage the power amp!
1. One 4-ohm cabinet connected to a 4-ohm jack;Summary: 4 Z, -> connected to 4-ohm output.
2. Two 8-ohm cabinets connected to the 4-ohm jacks;Summary: 8 Z + 8 Z, -> connected to 4-ohm + 4-ohm output.
3. One 8-ohm cabinet connected to an 8-ohm jack;Summary: 8 Z, -> connected to 8-ohm output.
4. Two 16-ohm cabinets connected to the 8-ohm jacks;Summary: 16 Z + 16 Z -> connected to 8-ohm + 8-ohm output.
5. One 16-ohm cabinet connected to the 16-ohm jack;Summary: 16 Z -> connected to 16-ohm output.
6. An 8-ohm cabinet connected to one of the 4-ohm jacks in combinationwith a 16-ohm cabinet connected to one of the 8-ohm jacksSummary: 8 Z + 16 Z -> connected to 4-ohm + 8-ohm output.
abinet options
abinet options
abinetoptions
see the chapter
see the chapter
see the chapter
C
C
C
16
Handling and Care:
* Keep the amp safe from hard knocks and shocks. Tubes are fragile and tendto suffer when exposed to mechanical stress!
* Let the amp cool down before you transport it. Ten minutes or so will sparethe tubes.
* Tubes take some 20 seconds to warm up after you switch the power on, andabout two to three minutes before they are able to pump out full power. Makea habit of giving your amp plenty of time to get toasty and flipping the Standbyswitch for short breaks.
* In order to spare the power tubes and prolong their lifetime, we recommendto set the Stand By switch to (0 position, that is) before you switchthe amp on. After a period of 30 seconds you may activate the poweramp byflipping the Stand By switch.
* Avoid storing the amp in damp or dusty rooms to spare jacks, switches andpotentiometers. If you don't use the amp all the time, I recommend that youdrape a covering over it to prevent the intrusion of dust. Even better, keep itin a transport cover or flight case.
* Never use caustic or scouring detergents to clean the amp's housing, front orrear panels. Use a soft, damp cloth or sponge with diluted soapsuds or astandard brand of mild dishwashing liquid instead. Never use solvents they cancorrode the amp's vinyl skin and dissolve the front and rear panel labels. Keepliquids well away from the amp, particularly the interior of the housing.
* Make sure air can circulate at the rear and top of the amp to allow foradequate cooling, which increases component life.
* Never operate the amp without an adequate load (a speaker, cabinet orsuitable terminating resistor).
* High ambient temperatures place an additional strain on diverse components; soif at all possible, avoid operating the amp at temperatures far higher than 30°Cfor longer periods. Running the amp at mains voltages exceeding the nominalmains input voltage over longer periods can also shorten component life.
* Replace tubes with selected tubes that satisfy ENGL selection criteria to forestallmicrophonic properties, undesirable noise and unbalanced power amp signals.Because power tubes' idle current (bias) must checked and possibly adjustedwhen replacing tubes, this is a job best left to experienced and authorizedspecialists.
Stand By
17
Troubleshooting
* Some features that may be controlled remotely using a Z-9 or Z-4 footswitchfail to respond when you change settings:
* The amp fails to respond when you try to control switching functions remotelyvia the Z-9 footboard.
* The amp fails to respond when you try to control switching functions remotelyusing a footboard such as the Z-4 or a MIDI switcher such as the ENGL Z-11.
* The amp is not providing an output signal / no sound is emanatingfrom the speaker.
-> Powerful static charges, strong radio signals, or mains voltage spikes can affectmicrocontroller-driven systems, setting them to an undefined status commonlycalled a hung chip. In this event, your only choice is to reset the system. Simplyswitch the amp off and on again.
-> If a reset doesn't solve the problem, there is a defect in the control system,probably on the logic board holding the microcontroller or merely a faultycontact on one of the four stereo footswitch jacks (21, 22, 23, 24). In this case,consult an authorized service center or a professional specialist.
-> Is the Z-9 footboard connected to the S.A.C. Port (21)?-> Is the cord you are using stereo, intact, and wired properly?
(Refer to page 22 for pin assignments.)
-> Are the footboards or switching loops connected to the correspondingfootswitch jacks (22, 23, 24)?
-> Are the cords you are using stereo, intact, and wired properly?(Refer to page 22 for pin assignments.)
-> If you are using footswitches other than an ENGL Z-4 or Z-11, are the switchesor relays inside the boards or switching loop systems off / on Single Pole SingleThrow (SPST) switches? In other words, do these switches continuously connectto GND when you wish to activate the given function? If you're unsure aboutthe answers to these questions, consult an authorized service center or aprofessional specialist.
-> Is at least one speaker connected to the speaker outputs 4 ohms, 8 ohmsor 16 ohms (35, 36, 37, 38, 39) ?
-> Is the power amp activated (Standby switch to ON) ?-> Are all cords (guitar, effect, and speaker) connected properly
and are they functional ?-> Unplug connected effectors and see if the preamp works fine without
these peripheral devices.-> Is the Noise Gate activated in one of the Lead channels and the Threshold (29)
knob set to a high value? Deactivate the Noise Gate (29) for a quick check.-> Are the active Master knob and the Gain and Volume knobs set to a value
greater than 0 ? If any of these knobs is set to 0, no signal is routed tothe amp's outputs.
18
-> You may be looking at a faulty tube or another defect. In this case,be sure to take the preamp to an authorized, professional service center.
-> Is there a connection (for example, via a shielded circuit) between theamp and another device that is grounded via a power plug of its own?Two or more circuits sharing a common electrical ground line can causeaudible hum. If low-frequency noise is emanating from your rig,be sure to consult a specialist.
-> The amp and mains grounds are not connected properly or are altogetherdisconnected. Have an experienced specialist check this.
-> Cords connected to the input or effect loops may not be shielded properly.Replace them to check if this is indeed the case.
-> The amp or speaker cords may be picking up interference from powerfulmagnetic fields (for example, of nearby power transformers or electrical motors).Reposition the amp and connector cables.
-> The amp or speaker cords may be picking up radio signals, for example,from activated mobile telephones or powerful local transmitting stations nearby.Switch off mobile phones while troubleshooting noise problems.
-> The given power tube is probably defective. If that power tube's fuse is replacedand the new fuse also blows, the tube needs to be swapped out.
-> The amp has been overloaded, perhaps by excessive volume levels, excess mainsvoltage, or the wrong output impedance (where the impedance setting does notmatch the connected speaker's impedance).Check the speakers' overall impedance and, if necessary, adjust your setupaccordingly (see the list on page 16). Refer to section 28 for some more key factsabout tube defects.
* The speaker is emitting humming noises:
* One of the power tube fuses blows:
19
Technical Data
Output power:
Input sensitivity levelsInput:
Output levels
Power consumption:
Fuses:
Important:
Tubes
Logic control system
System interface:
Dimensions:
Weight:
Effect Return:
Effect Send:
at 220/230/240 mains voltage
at 100/115/120 mains voltage
Power Tube Fuses:
V1:V2, V3:V4:V5, V6, V7, V8:Consult Tube Mapto view tube array
Processor, software:
(S.A.C.)Serial Amp Control
20
E765: 100 watts;E762: 50 watts
range: --40 dB to -10 dB (Channel 1),
range: -20
E765: approx. 410 Watt (490 VA) max.E762: approx. 220 Watt (260 VA) max.
E765: 2 AT LE762: 1,25 AT LE765: 4 AT LE762: 2,5 AT LE765: 4 x 160 mAME762: 2 x 160 mAM
ECC83 selected;ECC83 standard;
71 x 27 x 27 cmapprox. 27.9" x 10.6" x 10.6" (l x h x d);
approx. 22,5 kg (E765)approx. 49,4 lbsapprox. 21 kg (E762)approx. 46,3 lbs
-20
approx. (l x h x d);
approx.approx.
adjusted accordingly to 4, 8 and 16 ohms;
(T: slo-blo);
(M: medium-blo);
ECC83 F.Q., input tube;
EL34, matched sets; (V7 & V8 only in E765 Amp)Replace tubes with selected sets only!
;
AT89C2051 µC with internal 2K Flash Memoryfor software source code; Upgradeable withexternal Programmer;
Proprietary ENGL asynchronous data protocol
Replace these with fuses of the same typeand rating only!
max. 0 dBrange: dB to 0 dB, max. 5 dB
.
dB to 0 dB, max. 5 dB
Tube Map:
Tube replacement report:
1. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
3. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _
Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
the tubes and their function:V1 - ECC83 (12AX7): input stage, 2. gain stage; grade: FQ selectedV2 - ECC83 (12AX7): Channel 2 driver stage, 4. stage; grade: selectedV3 - ECC83 (12AX7): FX buffer stage, poweramp driver stage; grade: selectedV4 - ECC83(12AX7): phase splitter; grade: standardE762: V5, V6: EL34: power tubes, poweramp, matches setE765: V5 to V8: EL34: power tubes, poweramp, matches sets
21
V1 V2 V3 V4
MainsTransformer
OutputTransformer
amp chassisas viewed
from above;Front panel Input Input
V5 V6 V7 V8E765:
V5 V6E762:
ON/OFFON/OFF
R
Amp
Tube
FOOTPEDALZ-4
Your Options for controlling the ENGL Retro Tube amp remotely:
#1 ENGL Z-9 Custom Footswitch: This specialized footboard connects to the amp via a 6.3 mm (¼ ”) stereo cord plugged into the Serial Amp Port - S.A.C. (21). The Z-9 affords you direct access to the amp's two Channels in combination with Gain Boost simply by tapping the four channel switching buttons, and lets you control two special functions, for example, Tone and FX Loop.As an alternative to the Z-9 footswitch, you can also connect the ENGL Z11-S.A.C. MIDI Switcher (S.A.C. Out) to the amp's S.A.C. Port for use as a MIDI interface.
#2 A two-way footswitch such as the ENGL Z-4: Connect dual footswitches to the amp by plugging stereo 6.3 mm (¼ ”) cords into jack nos. 24, 23, and 22. -> Channel 1< >2 and Gain Boost (1 x Z-4);-> Master A/B and Tone (1 x Z-4);-> FX Loop and Noise Gate (1 x Z-4);As an alternative to dual footswitches, you can connect a MIDI switcher (the ENGL Z-11 will do nicely) to thesethree jacks to control the six switching functions.
#2
#1
R
AmpTechnology
Tube
CustomFootswitch
Z-9
Ser.Cnt.:Channel 1
Ser.Cnt.:Channel 2
Ser.Cnt.:Channel 3
Ser.Cnt.:Channel 4
Ser.Cnt.:Function 1
Ser.Cnt.:Function 2
MIDI:Patch 1/6
MIDI:Patch 2/7
MIDI:Patch 3/8
MIDI:Patch 4/9
MIDI:Patch 5/10
MIDI:Bank A/B
Power Supply In7-14 Volts AC9-20 Volts DC
approx. 100 mA
MIDIOut
Serial AmpControl Out
Caution !Connect To
AmplifierOnly!
Design byHorst Langer
To assign Amp switchingfeatures to the Function1 and 2 button, press the
Channel 1 and therespective Function button
simultaneously until theLED starts flashing.Now use the buttons
1 to 4 to selectthe desired switching
feature (press 1x or 2x).Store the selected
switching feature by pressing the opposite
Function buttonfor approx. 1 second.
Wiring of Principal Connectors
Stereo1/4" jack
Serial Amp Control Port (21)
tip: + 5 volts
ring: Data
sleeve: Ground, GND
Very important:use a stereoplug only!Connect ENGL Custom Z-9 Footswitch only!
Stereo1/4" jack
Dual Footswitch (22, 23, 24)
tip: refer to *T
ring: refer to *R
sleeve: Ground, GND
Use a stereoplug only!
page: 12
Stereo1/4" plug
ringtip
sleeve
Here you'll find at a glance the technical details of the Retro Tube Amp's various remote switching capabilities:A switch connected to this terminal *R controls Noise Gate; off <-> on via jack 22; Tone; passive <-> active via jack 23; Gain Boost; passive <-> active via jack via jack 24.A switch connected to this terminal *T controls FX Loop; off (bypassed) <-> on (enabled) via jack 22; Master A/B; Master A <-> Master B via jack 23; Channel 1< >2; Channel 1 <-> 2 via jack 24.
page: 11
22
#1 #2 #2 #2
Footswitch connectors(4 x stereo jack sockets)located at the rear panel of the amp.
(21) (22) (23) (24)
SERIAL AMP
CONTROL PORT
CAUTION:
CONNECT CUSTOM
FOOTSWITCH Z-9 ONLY!
CHANNEL
1 2
GAIN BOOST
FOOTSWITCH
MASTER
A/B
TONE
FX LOOP
NOISE GATE
OFF-ON
S.A.C. PORT
#1S.A.C. Out
The ENGL Z11-S.A.C. MIDI Switcher's rear panel
ENGL Z-9 Custom Footswitch
ENGL Z-4 dual footswitch
MIDI THRU MIDI INLOOP 1 & 2COM. L2 L1
SERIAL AMP
CONTROL OUT
(S.A.C.)
MIDI SWITCHER / TYPE: Z11-S.A.C.POWERSUPPLY
ENGL MIDI
FOOTCONTROLLERZ9, Z12, Z15
x
LOOP 3 & 4COM. L4 L3
12 Volts AC12 Volts DC
300 mALOOP 5 & 6COM. L6 L5
Configuration table for assigning the Retro Tube Amp's sound-shapingand special functions to the Z-9 Custom Footswitch's and :Functions 1 2
Button amps's Functions Setup Indication S.A.C.1: LED 1 lights
no 1: LED 2 lights1: LED 3 lights1: LED 4 lights
no 1: LED 1 flashes1: LED 2 flashes
no 1: LED 3 flashesno 1: LED 4 flashesno 2: LED 1 lightsno 2: LED 2 lightsno 2: 3 LED 3 lights
2: LED 4 lightsno 2: LED 1 flashes
2: LED 2 flashes2: LED 3 flashes
no 2: LED 4 flashes
Column 1 lists the Function button on the Z-9. Column 2 lists the sound-shapingand special functions that can be assigned to it.
Column 2 lists sound-shaping and special functions on the ENGL Retro Tube Ampthat can be controlled remotely via the Z-9 Custom Footswitch.
Column 3 lists the configuration or setting required to remote-controlsound-shaping or special functions on the Retro Tube Amp.The first digit indicates the routine, that is,1: for Setup and 2: for .
to denotes the button used to enter the setting.Column 4 indicates the currently or newly selected configuration. For example, if
LED 3 flashes when the Z-9's Setup routine is activated,then the Retro Tube Amp's switching feature is currently assigned to
; the corresponding S.A.C. command is .Column 5 lists the shorthand designations for specific configurations that appear
throughout the Z-9 Operator's Manual. For detailed information,please refer to the Z-9 Custom Footswitch Operator's Manual.
The ENGL Z-9 Custom Footswitch is an optional accessory. Theafore mentioned Function buttons, LEDs and setup routines pertain to the Z-9.
Function 1 Master A/B Channel 1 F1-1Function 1 Channel 2 F1-2Function 1 FX Loop off / on Channel 3 F1-3Function 1 Noise Gate off / on Channel 4 F1-4Function 1 Channel 1 F1-5Function 1 Tone Channel 2 F1-6Function 1 Channel 3 F1-7Function 1 Channel 4 F1-8Function 2 Channel 1 F2-1Function 2 Channel 2 F2-2Function 2 Channel F2-3Function 2 Noise Gate off / on Channel 4 F2-4Function 2 Channel 1 F2-5Function 2 Tone Channel 2 F2-6Function 2 FX Loop off / on Channel 3 F2-7Function 2 Channel 4 F2-8
Function SetupFunction 1 Function 2 Setup
Channel 1 Channel 4
Function 2FX Loop
Function 2 F2-7
Comments:
Please note:
23
24
Mounting Instructions: front panel frameCAUTION: Switch the amp off and pull the mains plug before you removethe front panel frame!
Remove the front panel frame:
pull the front panel frame (without the grille!) untilthe locking mechanism unlatches;
raise it slightly then remove it from front of the Amp.
A: Phillips screws8 pcs included, 2 pcs required per clasp;
B: clasp for locking mechanism (latch)4 pcs included, 2 pcs required for each front panel frame
C: required tool:Phillips screwdriver (not included);
Mounting Instructions: front panel frame
Fix the clasps on the front panel frame:
boreholes for the clasps; place the first clasp;
attach this clasp with two screws; tighten the screws carefully;
assemble the second clasp in the same way on the opposite side of the hole.
25
Mounting Instructions: front panel frame
CAUTION: Switch off the amp and pull the mains plug before you fit the frontpanel frame!
Install the front panel frame:
insert the bottom part of the front panel frame in the two milling grooveslocated at the base panel of the amp's housing;
Fit the front panel frame into the front side deepening of the amp's housing;
Push the front panel frame until the locking mechanism latches.
26
Space for User Notes:
27
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0
1
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pag
e:
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89
14
15
16
24
25
26
31
32
33
34
Su
pp
lem
en
t to
th
e R
etr
o T
ub
e S
eri
es
Man
ual fo
r th
e R
etr
o T
ub
e C
om
bo
Typ
e E
768
Tip
: Th
e a
bb
revia
tio
n "
OM
" n
ext
to a
pag
e n
um
ber
in t
he d
esc
rip
tio
ns
belo
w r
efe
rs t
o t
he
corr
esp
on
din
g p
ag
e in
th
e R
etr
o T
ub
e S
eri
es
op
era
tin
g m
an
ual.
Co
nte
nts
:(T
his
is
a d
ep
art
ure
fro
m t
he in
form
ati
on
giv
en
in
th
e R
etr
o T
ub
e S
eri
es
op
era
tin
g m
an
ual.)
1. EN
GL R
etr
o T
ub
e A
mp
Co
mb
o t
yp
e E
768 - 5
0 w
att
s;2. m
ain
s co
rd;
3. th
is m
an
ual an
d t
his
bro
chu
re f
or
the C
om
bo
Am
p;
4. a p
am
ph
let
en
titl
ed
In
stru
ctio
ns
for
the P
reven
tio
n o
f Fir
e, Ele
ctri
cal Sh
ock
an
d I
nju
ry.
No
ise G
ate
an
d R
everb
:(T
his
is
a d
ep
art
ure
fro
m t
he in
form
ati
on
giv
en
in
th
e R
etr
o T
ub
e S
eri
es
op
era
tin
g m
an
ual.)
A f
oo
tsw
itch
co
nn
ect
ed
to
po
rt 2
2X
or
the E
NG
L Z
-9 C
ust
om
Fo
ots
wit
ch c
on
nect
ed
to
po
rt 2
1 c
an
be
use
d t
o s
wit
ch o
n a
nd
off
th
e R
etr
o T
ub
e C
om
bo
's r
everb
syst
em
rath
er
than
th
e N
ois
e G
ate
.Y
ou
will
fin
d a
desc
rip
tio
n o
f th
e t
wo
reverb
co
ntr
ols
an
d d
eta
ils o
n h
an
dlin
g t
he r
everb
syst
em
in
th
is
sup
ple
men
t.
Fro
nt
Pan
el Featu
res
(Th
is is
a d
ep
art
ure
fro
m t
he in
form
ati
on
giv
en
in
th
e R
etr
o T
ub
e S
eri
es
op
era
tin
g m
an
ual.)
Rev-C
H1: R
everb
(C
han
nel 1)
Reverb
in
ten
sity
kn
ob
. Tw
ist
it t
o a
dju
st t
he a
mo
un
t o
f re
verb
fo
r C
han
nel 1. Tu
rn t
he R
everb
co
ntr
ol
kn
ob
clo
ckw
ise t
o in
crease
th
e e
ffect
's in
ten
sity
. Th
e s
ign
al re
main
s co
mp
lete
ly d
ry w
hen
th
e k
no
b is
set
to t
he p
osi
tio
n "
0"
or
if R
everb
is
deact
ivate
d
via
a f
oo
tsw
itch
. Y
ou
can
sw
itch
th
e r
everb
un
it o
n a
nd
off
usi
ng
a Z
-9 C
ust
om
Fo
ots
wit
ch c
on
nect
ed
to
th
e S
.A.C
. Po
rt
(21)
or
a f
oo
tsw
itch
co
nn
ect
ed
to
jack
(22X
). T
he r
everb
un
it is
alw
ays
on
if
yo
u d
o n
ot
plu
g a
fo
ots
wit
ch in
to t
he p
ort
(21)
or
jack
(22X
).
Rev-C
H2: R
everb
(C
han
nel 2)
Reverb
in
ten
sity
kn
ob
. Tw
ist
it t
o a
dju
st t
he a
mo
un
t o
f re
verb
fo
r C
han
nel 2. Tu
rn t
he R
everb
co
ntr
ol
kn
ob
clo
ckw
ise t
o in
crease
th
e e
ffect
's in
ten
sity
. Th
e s
ign
al re
main
s co
mp
lete
ly d
ry w
hen
th
e k
no
b is
set
to t
he p
osi
tio
n "
0"
or
if R
everb
is
deact
ivate
d
via
a f
oo
tsw
itch
. Y
ou
can
sw
itch
th
e r
everb
un
it o
n a
nd
off
usi
ng
a Z
-9 C
ust
om
Fo
ots
wit
ch c
on
nect
ed
to
th
e S
.A.C
. Po
rt
(21)
or
a f
oo
tsw
itch
co
nn
ect
ed
to
jack
(22X
). T
he r
everb
un
it is
alw
ays
on
if
yo
u d
o n
ot
plu
g a
fo
ots
wit
ch in
to t
he p
ort
(21)
or
jack
(22X
).
16X
Mast
er
AM
ast
er
A v
olu
me k
no
b. Lo
cate
d p
ost
eff
ect
lo
op
, it
co
ntr
ols
po
wer
am
p o
utp
ut.
Th
e r
ed
LED
to
th
e r
igh
t o
f th
e k
no
b lig
hts
up
to
in
dic
ate
Mast
er
A is
en
ab
led
an
d d
ete
rmin
ing
th
e
mast
er
level.
Yo
u c
an
sw
itch
betw
een
Mast
er
A a
nd
Mast
er
B u
sin
g a
Z-9
Cu
sto
m F
oo
tsw
itch
(S.A
.C. F1-1
, p
ag
e
23-O
M)
con
nect
ed
to
th
e S
.A.C
. Po
rt (
21)
or
a f
oo
tsw
itch
co
nn
ect
ed
to
jack
(23).
Fo
r m
ore
deta
ils a
nd
pra
ctic
al h
ints
refe
r to
pag
e 1
0-O
M!
27X
Mast
er
BM
ast
er
B v
olu
me k
no
b. Lo
cate
d p
ost
eff
ect
lo
op
, it
co
ntr
ols
po
wer
am
p o
utp
ut.
Th
e g
reen
LED
to
th
e r
igh
t o
f th
e k
no
b lig
hts
up
to
in
dic
ate
Mast
er
B is
en
ab
led
an
d d
ete
rmin
ing
th
e
mast
er
level.
Yo
u c
an
sw
itch
betw
een
Mast
er
A a
nd
Mast
er
B u
sin
g a
Z-9
Cu
sto
m F
oo
tsw
itch
(S.A
.C. F1-1
, p
ag
e
23-O
M)
con
nect
ed
to
th
e S
.A.C
. Po
rt (
21)
or
a f
oo
tsw
itch
co
nn
ect
ed
to
jack
(23).
Th
e M
ast
er
B c
on
tro
l p
ot
is lo
cate
d o
n t
he f
ron
t p
an
el o
f th
e C
om
bo
am
p.
Fo
r m
ore
deta
ils a
nd
pra
ctic
al h
ints
refe
r to
pag
e 1
0-O
M!
the t
ub
es
an
d t
heir
fu
nct
ion
:V
1 - E
CC
83 (
12A
X7):
in
pu
t st
ag
e, 2. g
ain
sta
ge; g
rad
e: FQ
sele
cted
V2 - E
CC
83 (
12A
X7):
Ch
an
nel 2 d
river
stag
e, 4. st
ag
e; g
rad
e: se
lect
ed
V3 - E
CC
83 (
12A
X7):
FX
bu
ffer
stag
e, p
ow
era
mp
dri
ver
stag
e; g
rad
e: se
lect
ed
V4 - E
CC
83(1
2A
X7):
ph
ase
sp
litte
r; g
rad
e: st
an
dard
V5, V
6: EL34: p
ow
er
tub
es,
po
wera
mp
, m
atc
hes
set
Tu
be M
ap
:
Gerä
teb
au
Gm
bH
Germ
an
yIn
tern
et:
htt
p:/
/w
ww
.en
gl-am
ps.
co
m
Text,
desi
gn
, g
rap
hic
s an
d layo
ut
by
Ho
rst
Lan
ger,
A
mp
Desi
gn
er
Tu
be r
ep
lace
men
t re
po
rt:
1. R
ep
lace
d o
n: _ _
_ _
_ _
_ 20 _
_ _
R
ep
lace
d b
y: _ _
_ _
_ _
_ _
_ _
_ _
_ _
Rep
lace
d t
ub
es:
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
Reaso
n: _ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
2. R
ep
lace
d o
n: _ _
_ _
_ _
_ 20 _
_ _
R
ep
lace
d b
y: _ _
_ _
_ _
_ _
_ _
_ _
_ _
Rep
lace
d t
ub
es:
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
_ _
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_ _
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Reaso
n: _ _
_ _
_ _
_ _
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_ _
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_ _
_ _
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_ _
_ _
_ _
_ _
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3. R
ep
lace
d o
n: _ _
_ _
_ _
_ 20 _
_ _
R
ep
lace
d b
y: _ _
_ _
_ _
_ _
_ _
_ _
_ _
Rep
lace
d t
ub
es:
_ _
_ _
_ _
_ _
_ _
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_ _
_ _
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Reaso
n: _ _
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V4
V3
V2
V1
Main
s C
on
nect
or
V5
V6
Main
sTra
nsf
orm
er
Ou
tpu
tTra
nsf
orm
er
Rear
pan
el
am
p c
hass
isas
vie
wed
fro
mth
e u
nse
rsid
e
Tube
Amp
Technology
Tube
Amp
Technology
29X
: N
ois
e G
ate
Th
resh
old
Level
Th
is c
on
tro
l act
ivate
s an
on
bo
ard
No
ise G
ate
to
su
pp
ress
an
y e
xce
ss n
ois
e g
en
era
ted
in
Ch
an
nel 2
wh
en
Gain
Bo
ost
is
act
ivate
d.
It e
ng
ag
es
wh
en
yo
u t
wis
t th
e k
no
b c
lock
wis
e t
o a
rou
nd
th
e 3
po
siti
on
.K
no
b s
ett
ing
s fr
om
3 t
o 1
0 s
et
the t
hre
sho
ld (
or
no
ise level)
at
wh
ich
th
is g
ate
tri
gg
ers
to
su
pp
ress
n
ois
e.
Th
e f
urt
her
yo
u t
wis
t th
e k
no
b t
ow
ard
s 10, th
e h
igh
er
the n
ois
e level w
ill b
e a
t w
hic
h t
he g
ate
tr
igg
ers
. W
hen
th
e k
no
b is
set
to 1
0, th
e N
ois
e G
ate
resp
on
ds
to e
xtr
em
ely
hig
h n
ois
e levels
, m
ean
ing
th
at
there
's n
ot
mu
ch o
f a m
arg
in b
etw
een
th
e g
uit
ar
sig
nal an
d b
ack
gro
un
d n
ois
e.
Info
: Th
e t
hre
sho
ld b
ott
om
s o
ut
wh
en
th
e k
no
b is
set
slig
htl
y t
o t
he left
of
the 2
po
siti
on
. To
d
eact
ivate
th
e g
ate
, tw
ist
the k
no
b t
o t
he f
ar
left
or
0 p
osi
tio
n.
Tip
: Th
e N
ois
e G
ate
on
Retr
o T
ub
e h
ead
s ca
n b
e r
em
ote
-co
ntr
olle
d v
ia f
oo
tsw
itch
; th
e N
ois
e G
ate
on
th
e R
etr
o T
ub
e 5
0 C
om
bo
can
no
t.
To
learn
mo
re a
bo
ut
this
an
d g
et
mo
re d
eta
ils o
n t
he N
ois
e G
ate
, se
e p
ag
es
15 a
nd
16 in
th
e O
M.
22X
Fo
ots
wit
ch: FX
Lo
op
, R
everb
Use
th
is jack
to
co
nn
ect
a c
on
ven
tio
nal fo
ots
wit
ch w
ith
tw
o s
wit
chin
g f
un
ctio
ns,
fo
r exam
ple
, th
e
EN
GL Z
-4 (
2 x
off
/on
- S
ing
le P
ole
Sin
gle
Th
row
or
SPST f
or
sho
rt).
Th
is t
yp
e o
f fo
ots
wit
ch lets
yo
u
acc
ess
Main
FX
Lo
op
on
/off
an
d R
everb
on
/off
. O
ne o
f th
e t
wo
sw
itch
es
en
ab
les
or
byp
ass
es
Main
FX
Lo
op
, w
hile
th
e o
ther
swit
ches
the r
everb
un
it o
n a
nd
off
.N
ote
als
o: A
fo
ots
wit
ch m
ay b
e e
qu
ipp
ed
wit
h L
ED
s in
dic
ati
ng
th
e g
iven
sw
itch
ing
sta
tus.
Each
of
the
two
sw
itch
es
is p
rovid
ed
wit
h a
pp
rox. 10 m
illia
mp
ere
s cu
rren
t, w
hic
h s
uff
ices
to p
ow
er
a s
tan
dard
LED
. Th
e jack
's m
on
o t
erm
inal co
ntr
ols
Main
FX
Lo
op
on
/off
, w
hile
th
e s
tere
o t
erm
inal co
ntr
ols
Reverb
o
n/o
ff (
for
pin
ass
ign
men
ts, se
e p
ag
e 2
2-O
M; at
the C
om
bo
Am
p t
erm
inal "R
" co
ntr
ols
Reverb
off
<->
o
n via
jack
22X
).
37X
, 38X
Po
wera
mp
Ou
tpu
t, 8
Oh
ms
Para
llel
8 o
hm
s sp
eaker
ou
tpu
t ja
cks,
in
tern
al co
nn
ect
ed
para
llel; t
he in
tern
al 8 o
hm
s sp
eaker
(co
mb
o: 1x12",
8
oh
ms)
is
con
nect
ed
to
on
e o
f th
is t
wo
jack
s. T
he im
ped
an
ce o
f an
ad
dit
ion
al ca
bin
et
sho
uld
bear
8 o
hm
s (f
or
the R
etr
o
Tu
be C
om
bo
am
p).
Sp
eaker
an
d c
ab
inet
op
tio
ns
(co
mb
inati
on
of
the in
tern
al sp
eaker
an
d a
n e
xte
rnal ca
bin
et)
fo
r th
e
Retr
o T
ub
e C
om
bo
am
p o
nly
:1. In
tern
al sp
eaker
(1x12",
8 o
hm
s) o
nly
, c
on
nect
ed
to
an
8-o
hm
jack
(w
ith
ou
t an
exte
rnal sp
eaker
cab
inet!
); Su
mm
ary
: N
o e
xte
rnal ca
b; in
tern
al 8 Z
-> in
tern
al to
8-o
hm
ou
tpu
t.2. A
n e
xte
rnal 8-o
hm
cab
inet
an
d t
he in
tern
al sp
eaker
(1x12",
8 o
hm
s) c
on
nect
ed
to
th
e 4
-oh
m jack
s. W
hen
yo
u u
np
lug
th
e c
ab
le f
or
the e
xte
rnal ca
bin
et,
en
sure
yo
u p
lug
th
e in
tern
al sp
eaker
back
in
to a
8-o
hm
jack
! Su
mm
ary
: Exte
rnal 8 Z
+ in
tern
al 8 Z
->
exte
rnal to
4-o
hm
+ in
tern
al to
4-o
hm
ou
tpu
t.
3. A
n e
xte
rnal 16-o
hm
cab
inet
con
nect
ed
to
on
e o
f th
e 8
-oh
m jack
s an
d t
he
in
tern
al sp
eaker
(1x12",
8 o
hm
s) c
on
nect
ed
to
on
e o
f th
e 4
-oh
m jack
s.
W
hen
yo
u u
np
lug
th
e c
ab
le f
or
the e
xte
rnal ca
bin
et,
en
sure
yo
u p
lug
th
e
in
tern
al sp
eaker
back
in
to o
ne o
f th
e 8
-oh
m jack
s! Su
mm
ary
: Exte
rnal 16 Z
+ in
tern
al 8 Z
->
exte
rnal to
8-o
hm
+ in
tern
al to
4-o
hm
ou
tpu
t.
Fo
r d
ivers
e c
ab
inet
op
tio
ns
wit
ho
ut
the in
tern
al sp
eaker
see p
ag
e 1
6-O
M!
Tech
nic
al D
ata
Pag
e 2
1 o
f th
e O
M f
or
the E
762 5
0-w
att
head
als
o a
pp
lies
to t
he E
768 C
om
bo
:A
part
fro
m:
Dim
en
sio
ns:
ap
pro
x. 57 x
44 (
48)
x 3
0 c
m (
l x h
x d
); a
pp
rox. 22.4
" x 1
7.3
6"
(18.9
") x
11.8
" (
l x h
x d
);W
eig
ht:
ap
pro
x. 25 k
g; ap
pro
x. 55.1
lb
s;
Co
nfi
gu
rati
on
tab
le f
or
ass
ign
ing
th
e R
etr
o T
ub
e A
mp
's s
ou
nd
-sh
ap
ing
an
d s
peci
al fu
nct
ion
s to
th
e Z
-9 C
ust
om
Fo
ots
wit
ch's
Fu
nct
ion
s 1 a
nd
2 (
pag
e 2
1-O
M):
A
part
fro
m c
on
tro
llin
g t
he r
everb
syst
em
via
th
e Z
-9 f
oo
tbo
ard
:B
utt
on
a
mp
s's
Fu
nct
ion
s S
etu
p I
nd
icati
on
S.A
.C.
Fu
nct
ion
1 R
everb
off
/ o
n 1: C
han
nel 4 LED
4 lig
hts
F
1-4
Fu
nct
ion
2 R
everb
off
/ o
n 2: C
han
nel 4 LED
4 lig
hts
F
2-4
SERIAL AMPCONTROL PORT
CAUTION:CONNECT CUSTOMFOOTSWITCH Z-9 ONLY!
CHANNEL1 2
GAIN BOOST
FOOTSWITCH
MASTERA / BTONE
FX LOOP
SENDRETURNBALANCE
DRYEFFECT
POWERAMP OUTPUT
48 OR8 ANDOr >
1 x 8 OHMS2 x 16 OHMS
INTERNAL SPEAKER
1 x 4 OHMS2 x 8 OHMS
816 OR16 AND16 OR >
DO NOT OPEN !
RISK OF ELECTRIC SHOCK !
DO NOT EXPOSE THIS EQUIPMENT
TO RAIN OR MOISTURE !
CAUTION !!
HRB 6238
FX LOOPREVERBOFF-ON
S.A.C. PORT
REPLACE FUSE
ONLY WITH SAME TYPE
AND RATING !
POWER TUBE V6FUSE
POWER TUBE V5FUSE
R
All-tube Guitar Combo AmpRetroTube 50 - E768
designed by Horst Langer
optically refined by Edmund Engl
MADE IN GERMANY
8 OHMS PARALLEL 4 OHMS PARALLEL16 OHMS
1 x 16 OHMS
DO NOT OPEN FUSEHOLDER
WHILE AMP IS SWITCHED ON !
REPLACE FUSES ONLY AGAINST
SAME TYPE AND RATING !
CAUTION !
POWER TUBE FUSES
Amp
Tube
1
page: >6< <--------------------------------- 9 ---------------------------------> >S<<---- 9 ----> <------------------ S ------------------> <------ 10 ------>
151718
20
page: <-- 16 --> <--- S ---> >16< <---------- 15 ---------->
19
16X
353637X
89101112Rev-CH21327X29X
38X2533
23456Rev-CH171428
393031322122X2324
page: >6< <------------------------- 7 --------------------------> >S<>7< >9< >13<
>13< >15<<------ 11 -----> >11< >S< <---12 --->
Explanation: “S” stands for the description of the function in this supplement, while the page number refers to the corresponding page in the Retro Tube operating manual.
CHANNEL
MIDDLETREBLE
TONE
INPUTBASS GAINREVERB
MASTER A
POWER STAND BY
VOLUME
GAIN
BOOST
MIDDLETREBLE
BRIGHT
BASS GAINREVERBVOLUME
MASTER BNOISE GATE
THRESHOLD
POWER
TUBE
FUSE
1
2
CH 2
CH 1
0
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
10 0
1
2
3
45
6
7
8
9
10
0
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
10
0
1
2
3
45
6
7
8
9
100
1
2
3
45
6
7
8
9
10
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