I have long loved the sound of a good treble booster and have owned many variations. Since discovering this site I have built a few Red Rooster treble boosters and they are probably my favourite of the genre. They're not far from the original Rangemaster circuit.
But sometimes building with germanium transistors can be a pain (although oddly enough my latest Ge Red Rooster was a breeze) and they can tend to be noisy. So I decided to try building a silicon version to see how close I could get to a Ge version. And as it turns out you can get very close indeed. With the layout below - which is verified - I can get very, very close to the sound of my Ge RRs. Germanium transistors do seem to have a little extra magic in the mids but overall I would happily use the silicon version for gigs or recording - it's obviously a lot less temperamental and is substantially quieter. I primarily use it as a boost for an already slightly dirty sound. As you can see, the differences are minor.
I considered getting rid of the trimmer but it does alter the sound in a subtle way - you can go from hard and tight to slightly looser and more splatty. It's subtle but useful enough to keep it there I reckon.
Thanks big time to Mark for the original layout!