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aion 424 PREAMP Manual

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Table of Contents

PROJECT NAME
424 PREAMP
BASED ON
Tascam 424
EFFECT TYPE
Distortion / EQ
PROJECT SUMMARY
A pedal conversion of the input preamp of the Tascam 424 four-track tape recorder, most notably used
by Mk.gee for his main drive tone.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
424 TAPE PREAMP
BUILD DIFFICULTY
Beginner
DOCUMENT VERSION
1.0.0 (2025-03-28)
1

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Summary of Contents for aion 424 PREAMP

  • Page 1 PROJECT NAME 424 PREAMP BASED ON BUILD DIFFICULTY Tascam 424 Beginner EFFECT TYPE DOCUMENT VERSION Distortion / EQ 1.0.0 (2025-03-28) PROJECT SUMMARY A pedal conversion of the input preamp of the Tascam 424 four-track tape recorder, most notably used by Mk.gee for his main drive tone.

  • Page 2: Table Of Contents

    But, the DTF is not based directly on any specific model as far as we know— so while it does capture the spirit and functionality, the 424 Preamp is actually an exact copy of what Mk.gee uses.

  • Page 3: Parts List

    PARTS LIST This parts list is also available in a spreadsheet format which can be imported directly into Mouser for easy parts ordering. Mouser doesn’t carry all the parts—notably potentiometers—so the second tab lists all the non-Mouser parts as well as sources for each. →...
  • Page 4 PARTS LIST, CONT. PART VALUE TYPE NOTES 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 100n MLCC capacitor, X7R Power supply filter capacitor. 1N5817 Schottky diode, DO-41 LM833 Operational amplifier, dual, DIP8 IC1-S DIP-8 socket IC socket, DIP-8 NJM4565D Operational amplifier, dual, DIP8 IC2-S DIP-8 socket IC socket, DIP-8...

  • Page 5: Build Notes

    BUILD NOTES IC selection The original Tascam 424 uses the μPC4570 for IC1. This IC is no longer available in through-hole DIP format, though old-stock parts can be found in small quantities. However, the LM833 is an exact replacement with identical specifications, so it’s recommended to use this IC instead.
  • Page 6 SCHEMATIC IC1B LM833 1N5817 100uF 47uF 100n IC1A HIGH 10uF LM833 100kB IC2B NJM4565D 10uF 10pF 100pF IC2A NJM4565D 110k 470k 10uF 10uF 47pF 470k 100kB 424 TAPE PREAMP...

  • Page 7: Drill Template

    DRILL TEMPLATE Cut out this drill template, fold the edges and tape it to the enclosure. Before drilling, it’s recommended to first use a center punch for each of the holes to help guide the drill bit. Ensure that this template is printed at 100% or “Actual Size”. You can double-check this by measuring the scale on the printed page.

  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B 424 TAPE PREAMP...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM N.C. N.C. OUT GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. 424 TAPE PREAMP...

  • Page 10: Document Revisions

    LICENSE & USAGE No direct support is offered for these projects beyond the provided documentation. It’s assumed that you have at least some experience building pedals before starting one of these. Replacements and refunds cannotbe offered unless it can be shown that the circuit or documentation are in error. All of these circuits have been tested in good faith in their base configurations.

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