Vox Mccoy transistor issue

Frequent questions about dead or faulty pedals. Whether you repair, mod or build pedals, debugging is important. Threads about general debugging problems irrespective of the circuit involved...
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herrflick
Posts: 2
Joined: 06 Sep 2013, 20:38

Post by herrflick »

Hi everyone,

recently i started to build vox mccoy from scratch, but i have problem with voltage on one of the transistors. Voltage should be something like this:

Q2: 8.7 (C)
3.9 (B)
3.3 (E)

and i have 9.24V on collector,inconstatnt voltage on base (0.00 to 0.32) and 0.00 on emitter. I'm using this schematic http://fuzzcentral.ssguitar.com/mccoy/mccoylayout.gif, I think the problem is in improper bias of the base Q2. Between R22k and C0.22uf voltage seems right (4v) but before R470k it drops to mentioned low value. I'm using BC108b.

thanks for eventually help

herrflick
Posts: 2
Joined: 06 Sep 2013, 20:38

Post by herrflick »

now it's ok, it was capacitor fault.

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