When designing the temperature controlled fuzz, Benson tried some unusual approaches.
One false start utilised a voltage controlled error correction circuit to bias a single germanium transistor. It ultimately didn’t work for the fuzz, which is comically sensitive to transistor gain attributes.

There was a place for it though...

It turns out it was perfect for achieving a germanium clean boost that, (like the fuzz) is impervious to component drift, leakage, and temperature.

A couple of other issues were fixed, preventing the germanium transistor from being used as a convincing linear boost, the input headroom was increased (even a normal guitar signal will drive a germanium transistor into unwanted input distortion without some tweaks) and increased the input impedance (a BJT transistor would normally thin out bass frequencies and interact negatively with whatever flows into it).

The result is a germanium clean boost that can utilise a germanium transistor without the weird artefacts that were previously accepted as part of the deal - temperature sensitivity, drift, and suboptimal input impedance and headroom.

After the boost is first powered up, it takes about ten seconds before the error correction circuit correctly biases the germanium transistor After this things get interesting you can hear how having the boost engaged makes guitar signals sound more musical, even when set at the same volume as the bypassed tone. Notes are given a simultaneously smoother and more detailed character, like a compressor but different. Some people have noted that it appears to de-emphasise the unwanted parts of a signal and enhance the good. It’s killer on bass. It helps acoustic guitar pickups sound more natural. And of course it’ll push your amp into a frenzy.

• 60 mm wide 110 mm high

PreAmp

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