Engl E670 Operator's Manual
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Engl E670 Operator's Manual

Full tube guitar amplifier with midi-control
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Special Edition
Full Tube
Guitar Amplifier
with MIDI-Control
Operator´s Manual
Please, first read this manual carefully!

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  • Page 1 Special Edition Full Tube Guitar Amplifier with MIDI-Control Operator´s Manual Please, first read this manual carefully!
  • Page 2 Tube Tube Technology Technology...

  • Page 3: Table Of Contents

    Table of Contents page Introduction Features and Functionality at a Glance Contents Front Panel Features: 6 - 10 Tube Driver; Clean and Crunch Channel Control Features 10,11 Power Amp EQ: Presence A/B, Depth Boost 11,12 Mega Lo Punch, Reverb, FX Loops 12 - 15 Input;...

  • Page 4: Features And Functionality At A Glance

    With the , you now own one of the Congratulations! Special Edition E670 most available today! advanced versatile amp heads This marries the unrivalled tone of sophisticated guitar amp all-tube technology the awesome sound-shaping might of control features powered by state-of-the-art .
  • Page 5 Simply plug in, play and be inspired by the tone of your ENGL amp! A few words of wisdom from the designer: Though this amp head is relatively easy to handle and you're probably raring to give it a go, I recommend that you read the owner's manual thoroughly before you power it up.

  • Page 6: Contents

    Contents: 1. ENGL E670 Tube Amp Head; 2. mains cord; 3. this manual; 4. a pamphlet entitled Instructions for the Prevention of Fire, Electrical Shock and Injury Front Panel Features At the back of the manual, you'll find fold-out diagrams of the front and rear panels.
  • Page 7 2 T.D.EQ. (TUBE DRIVER EQUALIZER) This function activates the onboard Tube Driver , a circuit similar to a very simple preamp channel. It could also be described as an active, tube-driven preamp defeat circuit, in this case with passive tone controls. Pressing the button (2) activates the Tube Driver with EQ.
  • Page 8 11 and 3 o'clock. Try settings between 9 and 1 o'clock for pickups with high- output humbuckers or active pickups. Bear in mind the Gain Boost function. You can activate it via an ENGL Custom Z-9 Footswitch or a preprogrammed MIDI preset to get an even bigger, beefier crunch tone on the fly.
  • Page 9 higher-gain Crunch sounds, your best bet is to turn the Treble Crunch knob down to prevent the pickups and speakers from generating feedback (a setting in the 10-to -1 o'clock range is recommended). The Clean and Crunch channels are equipped with dedicated Treble knobs so you can tweak the top end of each of the two channels separately to suit your taste and the given sonic scenario.

  • Page 10: Power Amp Eq: Presence A/B, Depth Boost

    ), The yellow LED to the right of the Crunch Volume knob (15) lights up to indicate the Crunch channel is active. The Crunch channel may also be activated via MIDI program change, the ENGL Custom Z-9 Footswitch or a dual footswitch.

  • Page 11: Mega Lo Punch, Reverb, Fx Loops

    19 PRESENCE B Power amp Presence B knob. This knob determines the power amp's high frequency response when Presence B is activated. The green LED next to the knob lights up to indicate Presence B is active. A tip from the designer: The two Presence knobs afford you a host of interesting and worthwhile options for shaping sounds: You can dial in different settings on the Presence A and B knobs (for example, set...

  • Page 12: Input; Lead I And Lead Ii Channel Control Features

    desired MIDI preset. Adjust the wet signal for the two Main Channels using the assigned Reverb knob (12, 35). Reverb can also be switched via MIDI program change or Custom Z-9 Footswitch. 23 FX LOOP I/II This button switches to and fro between FX Loop I FX Loop II .
  • Page 13 26 LEAD I GAIN This knob determines the Lead I channel's input sensitivity and preamp saturation level. Extremely high gain and volume levels in Lead mode can produce powerful CAUTION: feedback. Avoid feedback squeals; they can lead to hearing loss and damage speakers! At higher volumes, back off the Gain, Treble and Presence levels in order to prevent unchecked feedback! A tip from the designer:...
  • Page 14 This sound-shaping tool addresses midrange frequencies by slightly lowering the Mid knob's frequency spectrum. The LED above the button lights up to indicate Mid Edge activated. This feature can also be switched via MIDI program change or the ENGL Custom Z-9 Footswitch. A tip from the designer:...
  • Page 15 ). The red LED to the right of the Lead I Volume knob (36) lights up to indicate Lead I channel is active. It may also be activated via MIDI program change, the ENGL Custom Z-9 Footswitch, or a dual footswitch. 38 LEAD II VOLUME Determines the Lead II channel's level.

  • Page 16: Modern/Classic, Lo/Hi Power, Speaker A/B

    If your arsenal includes MIDI gear - for instance, the ENGL Z-15 MIDI Footcontroller - you can use the amp's master volume mute circuit to swiftly and conveniently set the power amp's level to 0 during short breaks or when switching axes.
  • Page 17 Speaker B activated. Speaker A/B can also be controlled via MIDI program change or the ENGL Custom Z-9 Footswitch. A tip from the designer: This feature is very useful if you want to make the most of the vast range of sounds offered by the amp.

  • Page 18: Power Amp Section: Master A/B

    Threshold (59) and Mute Depth (58) knobs on the back of the amp. The LED above the button lights up to indicate the Noise Gate is activated. This feature can also be switched via MIDI program change or the ENGL Custom Z-9 Footswitch. : The Noise Gate may open up inadvertently IMPORTANT note;...

  • Page 19: Write/Copy

    musical signal and noise. This makes it hard to find the right Threshold setting. It is entirely possible for this humming and other noise to rise to a level that deactivates the Noise Gate and therefore becomes audible. My advice is to stay as far away from transformers and power units as space allows.

  • Page 20: Stand By, Power

    48 STAND BY Power amp standby switch: Use this switch to silence (0 position) the amp when you take longer break. The amp's tubes stay nice and toasty, and the amp is ready to roll immediately when you ramp it back up to full power. More good-to-know info: On the one hand, the amp's surveillance system monitors if speaker cords are plugged into...

  • Page 21: Rear Panel Features

    This 5-pin DIN port accepts data sent by a MIDI sender (for example, the ENGL MIDI Z-12, Z-15, or Z-9 foot controllers) or from or routed through another MIDI device. Switch no. 54 lets you activate the amp's power supply if you have an ENGL MIDI foot controller connected to this port.
  • Page 22 55 MIDI CHANNEL & VOL.0 Use this set of encoding buttons (1, 2, 3, 4 and 5) to assign the MIDI channel. This tells the amp's MIDI system over which channel it will receive MIDI program change commands. Your choices are the standard 16 MIDI channels (numbered from 00 to 15), as well as OMNI mode (whereby all MIDI data is received regardless of the MIDI send channel).

  • Page 23: Noise Gate: Mute Depth, Threshold Level

    Again, I want to emphasize that you should never connect another foot board to this jack: The Z-9 controls the amp via a proprietary ENGL serial data protocol, and the Serial Amp Control Port was developed exclusively for ENGL amps.

  • Page 24: Fx Loops I, Ii And Serial: Send, Return, And Balance

    (46). A tip from the designer: Crunch Soft Lead Heavy Lead generate different levels of noise, and I tuned the ENGL Special Edition's Noise Gate accordingly. However, there is some minor matching variance between the three. Heavy Lead...
  • Page 25 65 FX LOOP II SEND Connect this FX Loop II output to a signal processor's input/return jack using the shortest possible shielded cord equipped with 1/4" plugs. Activate and deactivate it via the FX Loop I/II (23) button, which switches between these two loops. In the signal path, FX Loop II is located post preamp, post...

  • Page 26: Power Amp Output B: B1, B2, Impedance Selector

    A tip from the designer: The ENGL Special Edition's preamp and power amp supply two different signals. The reason for this is that the Presence control, Depth Boost button, power tubes and output transformer all shape the power amp signal's tone. You may have to adjust the voicing controls on your amp, mixer desk or recorder to adjust the line out signal accordingly.

  • Page 27: Power Amp Output A: A1, A2, Impedance Selector

    74 IMPEDANCE SELECTOR B Impedance selector for Poweramp Output B . Use this rotary selector to set the overall power amp output impedance for the two speaker outs B1 (75) and B2 (73). Your options are 4, 8, and 16 ohms. The selected impedance applies to both the B1 and the B2 outputs! That means if one cabinet is connected to Output B1 and another to...

  • Page 28: Ground Lift Switch

    A2 outputs! That means if one cabinet is connected to Output A1 and another to Output A2 , their actual overall impedance and the impedance setting selected on the amp must match! Impedance table for two cabinets connected in parallel: (|| stands for a parallel circuit) 16 ohms || 16 ohms ->...

  • Page 29: Tube Driver: Level, Contour, Bass, Mid, Treble, Sensitivity

    80 TUBE DRIVER: LEVEL This knob determines the Tube Driver circuit's output level as well as the effect loops' send level. It is enabled only when Tube Driver T.D.EQ are activated. Note that unlike a volume knob, it cannot turn the signal level all the way down to 0. TUBE DRIVER: CONTOUR Contour...
  • Page 30 A tip from the designer: You'll find that this test circuit is a very convenient utility, as it lets you check speaker, guitar, and signal processor patch cords (only the mono wire is tested!). Due to the higher resistance of longer cables, you may find that the 12 Z LED (92) rather than the 8 Z LED (91) indicates that the cable is O.K.

  • Page 31: Bias-Control-Panel

    91 8 Z; CABLE O.K. This green LED indicates the following results: 1. During an impedance check, it signifies an (overall) impedance of 8 ohms. 2. During the cable check, it signifies the cord is intact. 92 12 Z This yellow LED indicates the following results: During an impedance check, it signifies a relatively unusual (overall) impedance of 12 ohms.
  • Page 32 tube is operative in Hi Power mode (100 watts) only, that is, when function 44 is activated! 98 BIAS CHECK V4 Press this button to check the V4 power tube's bias (idle current). The LED chain comprising Hi BIAS (99), In Range (100), and Lo BIAS (101) indicates the results. 99 LED BIAS HI When checking a power tube's bias by pressing one of the four buttons, this red LED lights up to indicate the idle current is too high.
  • Page 33 A few words from the designer on your ENGL Special Edition Amp's sounds and settings as well as some practical tips: On the Subject of Sounds and Settings A great deal of effort went into tuning this tremendously versatile amp head;...
  • Page 34 Main Channel I ( Clean Crunch ) voicing controls respond differently than those of Main Channel II. In consequence, I suggest that you start by dialing in settings between 12 and 3 o'clock, tweaking each to taste and comparing the differences. Again, I opted for passive tone controls, which puts each knob's control range at about 10 dB.
  • Page 35 However, there's no need to panic in face of its sophisticated functionality. At ENGL, ease of use is paramount. We design all our amps so that players can dial in great sounds from the start - without hours spent researching the manual and struggling with settings.
  • Page 36 configuration possibilities. Case in point: You could insert an outboard preamp into Serial FX Loop as an alternative to the onboard preamp, and connect a multieffector to FX Loop I or . Then you could use the external preamp with the Tube Driver T.D.EQ.
  • Page 37 some parameters respond somewhat differently when the amp is equipped with EL34s. For example, the EL34 boosts output power by about 15%. This subjects the amp's components, including tubes, to greater wear and tear. More power spells higher volume, which culminates in more aggressive power amp saturation. Though this may sound tempting, I advise against driving the amp with EL34s over longer periods.
  • Page 38 Running the amp at mains voltages exceeding the nominal mains input voltage over longer periods can also shorten component life. Replace tubes with selected tubes that satisfy ENGL selection criteria to forestall microphonic properties, undesirable noise and unbalanced power amp signals.
  • Page 39 This option lets you access the amp's Master Volume Mute function via a suitable MIDI foot board. This foot board must like the ENGL Z-15 - be able to send MIDI controller 07 data. In order to afford access to Master Volume Mute, this function must be enabled using the corresponding encoding button on the back of the amp.
  • Page 40 You can set the encoding button (55) to OMNI reception to check if the preamp is actually receiving data. -> Is another foot board (the ENGL Z-9 or a two-way footswitch) connected and therefore blocking MIDI reception? The amp is not providing an output signal / no sound is emanating from the speaker.
  • Page 41 greater than 0? If any of these knobs is set to 0, no signal is routed to the amp's outputs. -> Did you send via MIDI foot board a MIDI controller 7 command with a value less than or equal to 5? This activates Master Volume Mute, thereby silencing the amp.
  • Page 42 MIDI controller 7 (main volume), value 0-5 = Master Volume Mute, Mute, value > 5 = default Master Volume level; Proprietary ENGL asynchronous data protocol Serial Amp Control: approx. 71 x 28 x 29 cm (l x h x d);...

  • Page 43: Front Panel

    System for BIAS Adjustment 6,3V - 200mA 6,3V - 200mA 6,3V - 200mA 6,3V - 200mA 50/100W 100W 100W 50/100W E670 chassis as viewed from above Input 2.stage 3.stage FX buffer phase Front panel & T.D. & Lead &...
  • Page 44 Mains voltage configuration: 230 or 240 Volts The device's mains voltage setting can be adjusted to 100 volts, 115 volts, 120 volts, 230 volts and 240 volts inside the device using plug-in connectors. The two illustrations of the voltage configuration board below show the respective configurations for each of the two mains voltages 230 and 240 volts.
  • Page 45 Mains voltage configuration: 100, 115, 120 Volts The device's mains voltage setting can be adjusted to 100 volts, 115 volts, 120, 230 or 240 volts inside the device using plug-in connectors. The three illustrations of the voltage configuration board below show the respective configurations for each of the three mains voltages 100, 115 and 120 volts.

  • Page 46: Wiring Of Principal Connectors

    Pin 2 - power supply page: 21 approx.11 volts AC * *: AC voltage is routed to pin 1 and 2 only when button 54 is set to ENGL MIDI Footcontroller. Dual Footswitch (57) Serial Amp Control Port (56) Stereo Stereo 1/4"...
  • Page 47 1. MIDI foot board (for example, the ENGL Z-12 or ENGL Z-15 pictured above): Connect the foot board to the amp using a standard 5-pin DIN cable. All 5 terminals of both connectors must be wired in a 1:1 configuration: MIDI data transmission requires two wires, and the ENGL MIDI foot board uses two more wires for purposes of power supply.
  • Page 48 Noting Settings: LEAN RUNCH REBLE REBLE LEAN RUNCH IDDLE EVERB RESENCE RESENCE L EAN RUNCH OLUME OLUME Special Edition T.D. ORMAL LTRA RESENCE EPTH EVERB FX L ERIAL LEAN RUNCH E.Q. RIGHT RIGHT A / B OOST UNCH CTIVE I / II FX L RIVER OOST...
  • Page 49 16 z CABLES TO THESE JACKS, < 4 z 12 z >16 z Special Edition - TYPE E670 ENSURE THEY ARE NOT RISK OF ELECTRIC SHOCK ! MADE IN GERMANY CONNECTED IN ANY KIND DO NOT EXPOSE THIS EQUIPMENT MPEDANCE...
  • Page 50 Tube Tube Technology Technology Gerätebau GmbH Germany Internet: http://www.engl-amps.com Text, design, graphics, photography and layout by Horst Langer, Amp Designer...

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