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PROJECT NAME
PHOBOS
BASED ON
Tone Bender Mk. III (3-knob)
EFFECT TYPE
Germanium fuzz
PROJECT SUMMARY
A reproduction of the third version of the Tone Bender germanium fuzz sold by Macaris in London in the
late 1960s.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
PHOBOS GERMANIUM FUZZ
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2020-07-03)
1
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Summary of Contents for Aion Electronics Phobos Germanium Fuzz
- Page 1 PROJECT SUMMARY A reproduction of the third version of the Tone Bender germanium fuzz sold by Macaris in London in the late 1960s. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). PHOBOS GERMANIUM FUZZ...
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Page 2: Table Of Contents
11 Document Revisions INTRODUCTION The Phobos Germanium Fuzz is a clone of the Colorsound / Sola Sound Tone Bender Mk III. While the first version was essentially the same topology as a Fuzz Face, and the second version added a gain stage... -
Page 3: Parts List
Electrolytic capacitor, 5mm 470n MLCC capacitor, X7R 100n MLCC capacitor, X7R 1N4742A Zener diode, 12V, DO-41 1N5817 Schottky diode, DO-41 Germanium Germanium diode, DO-07 Original uses 1N270, but part number isn’t important. Just use any NOS germanium diode. PHOBOS GERMANIUM FUZZ... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. PHOBOS GERMANIUM FUZZ...
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Page 5: Build Notes
• Q3: Collector -2v, Base -0.05v, Emitter 0v The -3.5v target voltage of Q1/Q2 is just a baseline. Some have reported great sounds with collector voltages as high as -6.5v. Use your ears and don’t be afraid to stray from what’s listed. PHOBOS GERMANIUM FUZZ... - Page 6 While the circuit isn’t lacking in available volume, if you’d like to get a little more out of it, you can reduce this resistor to 68k and then increase the volume control to 250kA. This gives you the same total resistance (~320k) so the tone and output impedance is unaffected, but available output volume is increased. PHOBOS GERMANIUM FUZZ...
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Page 7: Schematic
SCHEMATIC 1N5817 100uF 100n 10uF TC1044SCPA PWR_GND PWR_GND 470n 47uF PWR_GND PWR_GND Q3 BIAS 10kB 220k FUZZ 100kB 220pF 10uF GND GND PHOBOS GERMANIUM FUZZ... -
Page 8: Drill Template
INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” VOLUME FUZZ x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” PHOBOS GERMANIUM FUZZ... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B PHOBOS GERMANIUM FUZZ... -
Page 10: Wiring Diagram
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. PHOBOS GERMANIUM FUZZ... -
Page 11: 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!) DOCUMENT REVISIONS 1.0.0 (2020-07-03) Initial release. PHOBOS GERMANIUM FUZZ...
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