fuzz face clone problem

[vince76]

hi all.
I hope someone can help me:
I got five 2n508. tested it following Keen for hfe. they seems good.
I built a rangemaster clone following Keen again, great I was very happy. It worked after some little problem...
Then I decided to build a fuzz face clone, again using instruction find on geofex, but this time I can't resolve my problems. The sound level is very low and very noisy, I tried to correct bias the transistors but finally I don't know if I was able to. What have to try to fix?

thank you, vincenzo.

[R.G.]

hi all.
I hope someone can help me:
I got five 2n508. tested it following Keen for hfe. they seems good.
I built a rangemaster clone following Keen again, great I was very happy. It worked after some little problem...
Then I decided to build a fuzz face clone, again using instruction find on geofex, but this time I can't resolve my problems. The sound level is very low and very noisy, I tried to correct bias the transistors but finally I don't know if I was able to. What have to try to fix?

Hi, Vincenzo! Good work you're doing there. I used 2N508's for all of my early germanium builds. Good, consistent device.

I suggest you go over to the diystompboxes forum (there's a link at the top of this page) and get registered. I'm there all the time, and there's a stickie posting at the top of the forum all the time that says:"Debug thread- What to do when it doesn't work". There's a detailed set of instructions that I typed up that worked well enough that they're left posted there all the time.

[vince76]

thank you, I appreciate a lot your work, I think it's a wonderful think you want to share it with us.
I registered at diystompboxes forum and I'm waiting for approval.
Searching in the posts it's been useful to understand that there was an invisible (almost) connection between two traces. Anyway I truncated it and... wow it's the long time searched fuzz sounding. I still have to tune at best, solve noise problem, but I'm happy.

thank you, vincenzo

[vincediamond]

2N508 gain HFE is 120
NKT275 gain HFE is 90
AC128 gain HFE is 175
BC108 gain HFE can vary between 40 and 800