tatter wrote:Sounds GREAT! What sort of gains did you use in Q1,2 and 3? I found Q1 needed to be low hfe?
For Q1 I used an OC75 with Hfe about 65 and leakage around 250uA. I too found lower gain was best here, but no TOO low. 30 for example was two low and didn't give good sustain or saturation.
Q2 is an OC71, Hfe about 95 and leakage somewhere around 200uA. I liked higher gain that Q1 here, but I didn't find that it mattered too much if it was a lot higher. I tried a couple of high gain 2N404a's (~120 and 140) I had and it didn't make a significant difference to the sound to me, maybe just where the sweet spot on the attack pot was.
Q3 is a CV7003 (mil spec OC44) with Hfe around 90 and leakage aroun 75uA. I found the gain to not be too critical but the lower the leakage the lower the noise.
The only substitution I made was log taper for the attack pot. It seemed most of the change in sound happened in the first 25% or so of rotation, so the log taper made it a bit easier to tune in the sweet spot.