Tube screamer build not making any sound...

[adam_f]

Hi guys, could you help me debug my tubescreamer? I've build one already, but this time it's not working... I've been testing plugged into a power supply, and the IC is a JRC4558 from small bear. I've been looking for solder bridges and mistakes etc for ages, but I can't see anything.

1. Bypass is fine, but when engaged there's no output

2. TS 9 from Torchy's layout

3. http://www.indyguitarist.com/torchy/Distortion_Overdrive/Tubescreamer/

4. No modifications

5. Substituted the 51pF cap for a 47pf one.

IC1
1: 4.46
2: 4.55
3: 4.43
4: 0
5: 4.45
6: 4.42
7: 4.51
8: 9.02

Q1
C: 9.02
B: 1.83
E: 1.25

Q2
C: 9.02
B: 1.83
E: 1.25

D1
A: 0
K: 9.02

D2
A: 4.64
K: 4.44

D3
A: 4.58
K: 4.63

D4
A: 4.44
K: 4.58

Thanks a lot in advance,

Adam

[adam_f]

anyone got any ideas? I've noticed that the volume, gain and tone controls do have a slight affect on the background noise when it's engaged (ie it get's slightly noiser/louder etc). Also, I've compared transistor, diode and IC voltages with my working ts808 and it is almost exactly the same, so something's gotta be working right?

[yeeshkul]

That's the same problem i had - mind the pinout of your transistors. If you have Japanese trannies the pinout is ECB (facing the flat side, pins downwards). I had the completely same voltages - it must be the pinout.

[ulysses]

got your in wire and out wire round the right way?

cheers
ulysses