Enclosure not stated · 2 knobs
Sola Sound Tone Bender Professional MKIIVerified
Based on the Sola Sound Tone Bender MKII· 22 other boards clone it
From the post
This really doesn't need an introduction, one of the most iconic and important effect pedals to have ever been produced and an essential part of Jimmy Page's tone on at least a couple of well known Led Zeppelin albums. If you don't have one then just build it. Get a measured set of PNP germanium transistors to get the most out of it. If you are using lower gain transistors reduce 100K Q2 collector resistor, maybe consider a trimmer instead to fine tune.
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 12 rows
Report a wrong parseGot parts in a drawer? See what you can build with them.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 4 | ||||
| ×3 | 100K | 100k | read from the layout by eye | |
| ×1 | 10K | 10k | read from the layout by eye | |
| ×1 | 470R | 470 | read from the layout by eye | |
| ×1 | 8K2 | 8.2k | read from the layout by eye | |
| Capacitors 5 | ||||
| ×1 | 10n | 10n | small ceramic at the input; read from the layout by eye | |
| ×1 | 10nF | 10n | box film; read from the layout by eye | |
| ×1 | 100nF | 100n | box film; read from the layout by eye | |
| ×2 | 4u7 | 4.7u | electrolytic; one axial, one radial; read from the layout by eye | |
| ×1 | 47u | 47u | electrolytic; read from the layout by eye | |
| Transistors 1 | ||||
| ×3 | PNP Germanium | PNP GERMANIUM | type not given; legend: consider a matched Tonebender set; 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 |
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