aion IVP Preamp Manual
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aion IVP Preamp Manual

Preamp & tube overdrive simulator
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PROJECT NAME
IVP PREAMP
BASED ON
Intersound™ IVP
EFFECT TYPE
Preamp & tube overdrive simulator
PROJECT SUMMARY
A pedal conversion of the Intersound Instrument Voicing Preamplifier, a rack unit from the late 1970s
notably used by Steve Albini (Shellac) and Bob Weir (Grateful Dead).
Actual size is 7.15" x 2.30" (main board) and 6.61" x 0.67" (bypass board).
This is a complex circuit and it takes experience and attention to detail in order to build it
successfully. If you've never built a guitar pedal before, this shouldn't be your first. Please read all of
the build documentation to familiarize yourself with the project before you begin. Aion FX cannot
provide direct technical support.
IVP PREAMP
BUILD DIFFICULTY
Expert
DOCUMENT VERSION
1.0.0 (2021-07-30)
IMPORTANT NOTE
1

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Summary of Contents for aion IVP Preamp

  • Page 1 This is a complex circuit and it takes experience and attention to detail in order to build it successfully. If you’ve never built a guitar pedal before, this shouldn’t be your first. Please read all of the build documentation to familiarize yourself with the project before you begin. Aion FX cannot provide direct technical support.

  • Page 2: Table Of Contents

    Bob Weir of the Grateful Dead. The Aion FX IVP Preamp is a direct clone of the rackmounted unit in pedal format. It runs on the same voltage as the original, using a DC-DC converter to get +/-15V from a standard 9VDC input. The Clean and Tube Voice channels are footswitchable, and the other footswitch allows the whole unit to be bypassed.

  • Page 3: Circuit Design Notes

    A 9VAC adapter will destroy most other pedals if it’s plugged in, and if you own one, there’s an infinitely higher chance that it’ll be mistaken for a 9VDC adapter and plugged into the wrong pedal at some point. IVP PREAMP...
  • Page 4 The IVP has two effects loops, one that comes after the EQ and one that comes after the clean & drive channels. While these loops have been omitted from the pedal conversion, they can be added back without too much trouble. See build notes for more information. IVP PREAMP...

  • Page 5: Usage

    ○ Note that this switch is just a simple attenuator, equivalent to turning the master volume down slightly, and the master volume setting has a much larger impact on the output signal level. • Channel (footswitch) changes between Clean and Tube Voice channels. • Bypass (footswitch) bypasses the effect entirely. IVP PREAMP...
  • Page 6 All of the potential for unwanted clipping comes before those stages, so the signal levels afterward are unimportant. Note that if using the pre-voice effects loop, the peak detector comes before the loop, not after, so it does not detect the level of the returning signal. IVP PREAMP...

  • Page 7: Parts List

    Metal film resistor, 1/4W Can also use 14k, or two 27k resistors in parallel. Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W IVP PREAMP...
  • Page 8 Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W 100k Metal film resistor, 1/4W Metal film resistor, 1/4W 510R Metal film resistor, 1/4W Metal film resistor, 1/4W IVP PREAMP...
  • Page 9 Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 100n MLCC capacitor, X7R 100n MLCC capacitor, X7R Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm IVP PREAMP...
  • Page 10 Electrolytic capacitor, 6.3mm 47uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm 10uF Electrolytic capacitor, 5mm 1N4743A Zener diode, 13V, DO-41 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 1N914 Fast-switching diode, DO-35 IVP PREAMP...
  • Page 11 IC8-S DIP8 socket IC socket, DIP-8 TEC 3-0923 DC-DC converter, +9V to +/-15V See build notes for alternatives. XFM1 42TM018 Transformer, audio, 10KCT/10KCT 10uH Inductor, 10uH Bourns 78F100J-RC 10uH Inductor, 10uH Bourns 78F100J-RC 10uH Inductor, 10uH Bourns 78F100J-RC IVP PREAMP...
  • Page 12 1/4” phone jack, stereo, switched Neutrik NMJ6HC-S. Part of optional effects loop mod. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BYPASS 3PDT Stomp switch, 3PDT CHANNEL 3PDT Stomp switch, 3PDT ENCLOSURE 1590DD Enclosure, die-cast aluminum IVP PREAMP...

  • Page 13: Build Notes

    Due to the height of the DC converter, the components on the switching PCB are mounted on the bottom, the same side as the footswitch. This is in contrast with most other Aion FX projects where the switch is mounted on the bottom of the switching sub-board and the components face up.
  • Page 14 The Send jacks can be used to send a copy of the signal offboard, but only the Return of each loop is wired as a transfer jack. This means that unless the Return jack is used, the signal will not be interrupted. IVP PREAMP...
  • Page 15 430R, and it’s been verified in multiple actual units as being 430R. It appears to have been an error in the first version of the schematic that was inadvertently copied over to the second version, but it does not reflect production units. IVP PREAMP...
  • Page 16 1N914 IC8A JRC4558D 1N914 TUBE DRIVE 50kA 22pF GND GND XFM1 IC5A RC4558P Q3 Q4 47pF 2N5088 42TM018 IC6A RC4558P 2N3904 2N3904 2N5088 RC4558P CLEAN DRIVE LINE 50kA IC7B 22pF IC7A OUTPUT RC4558P -10dB 2N3906 IC6B RC4558P 2N3906 IVP PREAMP...

  • Page 17: Schematic

    CHANNEL C JACK Power supply +15V 10uH L1-L3: Bourns 78F100J-RC 10uF +VOUT +VIN 10uH -VIN -VOUT 100uF 47uF DC/DC CONVERTER 10uF -15V 10uH Power filtering 100uF 100n 100n 100n 100n 100n 100n 100uF 100n 100n 100n 100n 100n 100n IVP PREAMP...

  • Page 18: Drill Template

    The DC jack is offset by 0.5” to account for the additional screw anchor in the center of the 1590DD enclosure’s long side. The drill template includes holes for the optional effects loop jacks. The process for adding these is described on page 14. If you’re not using these, the four holes should be omitted. IVP PREAMP...
  • Page 19 ø9/32” ø1/4” CENTER (0,0) x: +3.15 y: 0 ø5mm x: +2.15 y: -1.43 BYPASS CHANNEL ø5mm CLEAN DRIVE x: -2.15 y: -1.58 x: +2.15 x: -2.93, y: -1.58 x: 2.93, y: -1.58 ø5mm y: -1.73 ø15/32” ø15/32” ø5mm IVP PREAMP...

  • Page 20: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. If using effects loops, see alternate wiring diagram on page 21 and information on page 14. 1590DD IVP PREAMP...

  • Page 21: Wiring Diagram

    WIRING DIAGRAM (NO EFFECTS LOOPS) OUT N.C. +15V -15V N.C. TS CLEAN TUBE TUBE JACK GND +V PWR JACK +15V -15V GND PCB SEND SEND 1590DD IVP PREAMP...
  • Page 22 WIRING DIAGRAM (WITH EFFECTS LOOPS) PRE-VOICE PRE-VOICE POST-VOICE POST-VOICE SEND RETURN SEND RETURN TRACE TRACE N.C. TS OUT N.C. +15V -15V CLEAN TUBE TUBE JACK GND +V PWR JACK +15V -15V GND PCB SEND SEND 1590DD IVP PREAMP...

  • Page 23: Document Revisions

    (In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) Intersound is a trademark of Aion FX. DOCUMENT REVISIONS 1.0.0 (2021-07-30)

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