Enclosure not stated · 2 knobs
Marshall Supa FuzzVerified
Based on the Marshall Supa Fuzz· 4 other boards clone it
From the post
Made for Marshall by Sola Sound this is essentially a slightly modified Tone Bender MkII. Fuzz Central state:
The only differences between the two: the input capacitor is 10µF instead of 5µF, the bypass capacitor on the "attack" pot is 10µF instead of 5µF, Q2's collector resistor is 47K instead of 100K, the resistor from the base of Q1 to ground is 10K instead of 100K, and the transistors are OC75 instead of OC81D. The sound of the pedals should be nearly the same, although the Supa Fuzz will probably be bassier since the input capacitor is quite a bit larger, especially with that 0.01µF from input to ground still in place, which removes even more treble.
Suggested mods
Fuzz Central suggest the following mods and the trimmer would seem like a good idea to me to accurately bias Q3:
470R changed to a 1K for more volume
8.2K changed to a 25K pot for external bias
Schematic
This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.
Parts list 14 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 5 | ||||
| ×2 | 10K | 10k | read from the layout by eye | |
| ×1 | 47K | 47k | read from the layout by eye | |
| ×1 | 470R | 470 | read from the layout by eye | |
| ×1 | 100K | 100k | read from the layout by eye | |
| ×1 | 8K2 | 8.2k | read from the layout by eye | |
| Capacitors 4 | ||||
| ×2 | 10nF | 10n | one small ceramic printed 10n (top left), one box film printed 10nF (right); read from the layout by eye | |
| ×1 | 100nF | 100n | read from the layout by eye | |
| ×2 | 10u | 10u | electrolytic; one axial printed 10U (left), one radial; read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| Transistors 3 | ||||
| Q1 | PNP germanium | PNP GERMANIUM | legend: consider a matched Tonebender set; read from the layout by eye | |
| Q2 | PNP germanium | PNP GERMANIUM | read from the layout by eye | |
| Q3 | PNP germanium | PNP GERMANIUM | read from the layout by eye | |
| Potentiometers 2 | ||||
| Volume | A100K | A100k | Potentiometer | read from the layout by eye |
| Attack | B1K | B1k | Potentiometer | read from the layout by eye |
Other boards based on the Marshall Supa Fuzz
- Marshall Supa Fuzz Dirtbox Layouts
- Marshall Supa Fuzz turretboard.org
- Marshall Supa Fuzz MK2 turretboard.org
- Marshall Supa Fuzz Proto turretboard.org