Acid Rain no voltage Q1 & Q2

[Kroars]

Built my fourth Acid Rain (love that circuit!) and I’m having a little trouble with it. Plugged it in and noticed that I can only hear the effect faintly when volume and gain fully CW. Bypass works great. I probed it and while one side of C3 (470p) is much quieter on the probe (unlike the working one I tested) everything else seems to check out. I replaced c3 just in case but same issue persists. Even got a signal going from input to output jack when effects on with the probe. Started taking voltage readings and noticed that Q1 & Q2 have 0v at collector. Q3 has 4.5v and Q4 has 5v. I’m stumped and really hoping someone can nudge me in the right direction.

50% of resistors were tested and all caps and transistors were tested prior to installation. Also tested volume pot and gain pot while in the circuit and both go from 0 to 100 just fine.

Hope everyone is having a great Saturday!

 

[Robert]

Check for continuity between the cathode of D1 (1N5817) and the positive lead of C1 (47uF).

If that's good then check continuity between the positive lead of C1 (47uF) and the bottom end of R10 (12K).

There are traces between those points that could take out the collector voltages of both Q1 and Q2 (without affecting Q3 and Q4) if they're damaged or have a bad solder connection.

 

[Kroars]

Check for continuity between the cathode of D1 (1N5817) and the positive lead of C1 (47uF).

If that's good then check continuity between the positive lead of C1 (47uF) and the bottom end of R10 (12K).

There are traces between those points that could take out the collector voltages of both Q1 and Q2 (without affecting Q3 and Q4) if they're damaged or have a bad solder connection.

You’re absolutely right, no continuity between positive of C1 and end of R10. I see the trace between the two, even used the old sucker to remove solder and test the two bright clean pads -still no continuity.... ah well, sh*t happens. At least I know I’m not crazy now. Thank you very much for taking the time help!

 

[Robert]

Excellent, that's a simple fix.