125B · 4 knobs
SomaVintage Overdrive
Based on the Cornish SS-3 Soft Sustain
- Category
- Overdrive
- Controls
- Sustain · Low Cut · Hi Cut · Volume
- Difficulty
- Intermediate
- Price
- $12.50in stock
From the vendor
An evolution of the MXR Distortion+ that adds two passive tone-cut controls as well as the classic Cornish input buffer.
The Soma Vintage Overdrive is adapted from the Pete Cornish SS-3, traced by Aion FX in 2019.
Cornish pedals are best known for being extremely expensive. There are two reasons for this. First, the build quality and reliability is unmatched. Second, the mysterious nature of them, partially due to the fact that the circuit is obscured and partially because of the A-list of clients such as Brian May and Pete Townshend.
The SS-3 in particular is owned by Jeff Beck, David Gilmour, Keith Urban and Carlos Santana among many others. It’s an update to the earlier SS-2 that adds a low-cut control, since the original was fairly bass-heavy. With the low cut control set fully clockwise, the circuit is identical to the SS-2.
Under the hood, the SS-3 appears to have originated from the MXR Distortion+ circuit and then had passive low & hi-cut tone controls added, along with the classic Cornish buffer at the input.
The Soma is a faithful reproduction of the SS-3 circuit, but with one major addition: an internal slide switch allowing the pedal to be used in true-bypass mode instead of buffered bypass. As with the Klon KTR, the buffered mode is “almost always better”, but with this feature, you can determine for yourself.
Schematic
The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 67 rows
Report a wrong parse| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 31 | ||||
| R1 | 10M | 10M | Metal film resistor, 1/4W | |
| R2 | 1k | 1k | Metal film resistor, 1/4W | |
| R3 | 120k | 120k | Metal film resistor, 1/4W | |
| R4 | 120k | 120k | Metal film resistor, 1/4W | |
| R5 | 200k | 200k | Metal film resistor, 1/4W | |
| R6 | 7k5 | 7.5k | Metal film resistor, 1/4W | |
| R7 | 10k | 10k | Metal film resistor, 1/4W | |
| R8 | 51R | 51 | Metal film resistor, 1/4W | |
| R9 | 1M | 1M | Metal film resistor, 1/4W | |
| R10 | 10k | 10k | Metal film resistor, 1/4W | |
| R11 | 1M | 1M | Metal film resistor, 1/4W | |
| R12 | 100k | 100k | Metal film resistor, 1/4W | |
| R13 | 510R | 510 | Metal film resistor, 1/4W | |
| R14 | 15k | 15k | Metal film resistor, 1/4W | |
| R15 | 1k6 | 1.6k | Metal film resistor, 1/4W | |
| R16 | 1k6 | 1.6k | Metal film resistor, 1/4W | |
| R17 | 1M | 1M | Metal film resistor, 1/4W | |
| R18 | 1M | 1M | Metal film resistor, 1/4W | |
| R19 | 1M | 1M | Metal film resistor, 1/4W | |
| R20 | 2k4 | 2.4k | Metal film resistor, 1/4W | |
| R21 | 10k | 10k | Metal film resistor, 1/4W | |
| R22 | 6k8 | 6.8k | Metal film resistor, 1/4W | |
| R23 | 10k | 10k | Metal film resistor, 1/4W | |
| R24 | 91R | 91 | Metal film resistor, 1/4W | |
| R25 | 100R | 100 | Metal film resistor, 1/4W | |
| R26 | 150k | 150k | Metal film resistor, 1/4W | |
| R27 | 180k | 180k | Metal film resistor, 1/4W | |
| R28 | 100R | 100 | Metal film resistor, 1/4W | |
| R29 | 91R | 91 | Metal film resistor, 1/4W | |
| R30 | 51k | 51k | Metal film resistor, 1/4W | |
| LEDR | 4k7 | 4.7k | Metal film resistor, 1/4W | LED current-limiting resistor. Adjust value to change LED brightness. |
| Capacitors 20 | ||||
| C1 | 100n | 100n | Film capacitor, 7.2 x 2.5mm | |
| C2 | 4.7uF | 4.7u | Electrolytic capacitor, 4mm | |
| C3 | 1n | 1n | Film capacitor, 7.2 x 2.5mm | |
| C4 | 22uF | 22u | Electrolytic capacitor, 5mm | |
| C5 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C6 | 220pF | 220p | MLCC capacitor, NP0/C0G | |
| C7 | 470n | 470n | Film capacitor, 7.2 x 3mm | |
| C8 | 3n3 | 3.3n | Film capacitor, 7.2 x 2.5mm | |
| C9 | 10uF | 10u | Electrolytic capacitor, 5mm | |
| C10 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C11 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C12 | 10n | 10n | Film capacitor, 7.2 x 2.5mm | |
| C13 | 220n | 220n | Film capacitor, 7.2 x 2.5mm | |
| C14 | 220pF | 220p | MLCC capacitor, NP0/C0G | |
| C15 | 10uF | 10u | Electrolytic capacitor, 5mm | |
| C16 | 22uF | 22u | Electrolytic capacitor, 5mm | |
| C17 | 100n | 100n | MLCC capacitor, X7R | Power supply filter capacitor. |
| C18 | 220uF | 220u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| C19 | 10uF | 10u | Electrolytic capacitor, 5mm | Reference voltage filter capacitor. |
| C20 | 220uF | 220u | Electrolytic capacitor, 6.3mm | Power supply filter capacitor. |
| Diodes 3 | ||||
| D1 | 1N5817 | 1N5817 | Schottky diode, DO-41 | |
| D2 | 1N34A | 1N34A | Germanium diode, NOS | Exact part number is unimportant, any NOS germanium diode should work about the same here. Can also substitute BAT46 Schottky diode. |
| D3 | 1N34A | 1N34A | Germanium diode, NOS | |
| Transistors 1 | ||||
| Q1 | 2N5088 | 2N5088 | BJT transistor, NPN, TO-92 | Substitute. Original uses BC549C. |
| ICs 2 | ||||
| IC1 | TL071 | TL071 | Operational amplifier, DIP8 | |
| IC2 | TL071 | TL071 | Operational amplifier, DIP8 | |
| Potentiometers 3 | ||||
| SUST. | 50kC | C50k | 16mm right-angle PCB mount pot | |
| HI CUT | 25kB | B25k | 16mm right-angle PCB mount pot | |
| VOL. | 10kA | A10k | 16mm right-angle PCB mount pot | |
| Switches 1 | ||||
| FSW | 3PDT | 3PDT | Stomp switch, 3PDT | |
| Jacks & sockets 5 | ||||
| IC1-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IC2-S | DIP-8 socket | DIP-8 SOCKET | IC socket, DIP-8 | |
| IN | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| OUT | 1/4" mono | 1/4" MONO | 1/4" phone jack, closed frame | Switchcraft 111X or equivalent. |
| DC | 2.1mm | 2.1MM | DC jack, 2.1mm panel mount | Mouser 163-4302-E or equivalent. |
| Hardware 1 | ||||
| ENC | 125B | 125B | Enclosure, die-cast aluminum | Can also use a Hammond 1590N1. |