[sdiy] Help with Buchla repair

[Paul Schreiber]

OK, I have this Buchla 200 boat anchor:

www.synthtech.com/pix/buchla

dead as a doornail. Thought I'd start with the 295 and 295 Comb Filters. Well, the 294 4-band is
NOT AT ALL the same circuits as the 294 10-band one.

Looking at the 294: has 4 14pin Fairchild ICs marked:

7749393
U6A7005

Well, I can say with all confidence they are not LM393s made with date code 7749. I think
building an audio comb filter from a dual comparator would be quite tricky :)

Also: the 10-band uses a ton of parts marked LM341H (H = metal can). However, this is NOT a
National voltage regulator (even harder to make comb filter from a voltage regulator than a
comparator). The logo, if my ailing memory serves, is a Teledyne.

I guessing this is so "fast" op amp. The date code is 7316.

Any schematics/help appreciated. I'm sure I'll have tons more as I probe deeper (this is my
little MOTM 'vacation').

Paul S.