Hybrid Silicon Germanium Fuzz 2N1304 and RCA 2N3440 Transistors

Description

Most fuzz pedals tend to lean one way or the other.

Germanium gives you softness, sag, and that slightly unpredictable cleanup that feels alive under your fingers.

Silicon gives you attack, stability, and the sharper edge that cuts through a loud amp properly.

This build sits directly between the two.
Q1 uses a vintage 2N1304 germanium transistor handling the front end of the circuit, while Q2 moves into an RCA 2N3440 silicon transistor to tighten the output stage and add the harder push that silicon devices became known for. The result is a fuzz that cleans up like an older germanium unit but still holds together when you really lean into it.

With the guitar volume rolled back, the circuit becomes bright, slightly glassy, and surprisingly articulate. Then as the volume comes back up the silicon output stage starts to take over, adding tighter bass response, more sustain, and a firmer attack without losing the softer edges underneath.

It feels less compressed than a full germanium fuzz and less rigid than a full silicon one.

This particular Abbey Road Fuzz is hand wired on tagboard using a mixture of modern and vintage components, built slowly and deliberately in the traditional way rather than around a PCB. Inside you will find carefully dressed wiring, old school construction methods, and the sort of layout that makes servicing and long term reliability straightforward.

The enclosure is finished in a split half black and half green hammered finish, giving the pedal the same visual contrast as the circuit itself. One side darker and more controlled. The other slightly unstable and alive. The Japanese storm in a teacup artwork sits between the two finishes, tying the whole thing together rather nicely.

Above the controls sits a small skull emblem whose eyes illuminate when the pedal is engaged. Slightly unnecessary perhaps, but so are most of the best things in old guitar gear.
Tonally this lands somewhere between the sharper British silicon fuzz sounds and the softer late 60s germanium circuits. There is still plenty of sustain available, but the attack remains touch sensitive and reactive to the guitar controls rather than flattening everything into saturation.

Unlike many vintage style hybrid fuzzes, this runs happily from a standard 9v centre negative power supply like most modern pedals, so it will sit straight onto a normal pedalboard without needing special wiring arrangements.

One off build.

Hand wired.

Built properly.

If you have ever wished a germanium fuzz had slightly more authority, or a silicon fuzz had slightly more soul underneath it, this is essentially that conversation in pedal form.