Son Of a Ben no signal

B

BJG

New member
Hey!
I built a Son of a Ben preamp and it won't pass any sound when engaged.
It passes signal in bypass and Q1-3 are biased to 4-5V each.
Any idea where I should check for bad connections? I feel like if I can bias the transistors, the majority of the circuit is good to go, but I'm an amateur, so who knows.
Thanks in advance for any advice!

IMG_2088.jpeg IMG_2090.jpeg
 
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jwin615 said:
First, thank you for not off board wiring everything.
Secondly, painters tape ain't gonna cut it.
Lastly, make sure the dual pot isn't contacting the pot above it.
Click to expand...
no contact on the dual pot, but there is tape below it to prevent any contact below; its possible the tape failed
 
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BJG said:
no contact on the dual pot, but there is tape below it to prevent any contact below; its possible the tape failed
Click to expand...
Painters tape is not gonna help. Electrical tape is also usually ineffective. Try a small piece of thick cardboard or, if the board is outside the enclosure, try lifting the pot a bit to see if that changes anything.

Some of the solder joints look like they may be cold but it’s a bit hard to tell from the pics. You also have a lot of flux residue, which shouldn’t be the cause of the problem but I suggest cleaning it up (you can use isopropyl alcohol) because in some cases it can create problems especially after a while. At the very least, the flux makes it a bit harder for us to see.
 
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