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Thanks for your guidance!

I used the audio probe as you suggested and realized that I was getting signal to c17 cap but not out of it. I changed it before I started asking and the problem was still there. When I realized that was where the issue was I changed it AGAIN and it worked. So two bad caps. Brand new. So...

I fixed it!!!!!!! :)

So I used my audio probe. There is no signal going to any of the terminals of the pot. There is signal at both resistors. Capacitor c17 has signal at the top solder (when board is oriented correctly but nothing from the bottom solder. I’ve resoldered, changed the cap, etc. any suggestions?

I actually just learned how to make an audio probe. It look a lot less time consuming than checking each component. Lol!!! I will try this. Thanks!

Do I need an audio probe or can I just use DMM? How exactly do I do this? Sorry... anytime I’ve trouble shot it was always testing actual components. I’ve been lucky and always found the issue. Lol.

I just put together a Thermionic Distortion and everything works great. Except the bass control. I have checked the pot, replaced the pot, checked the two resistors, (R18 and 19 if memory served me right), replaced the two resistors, checked the cap (c17 if memory serves me right), replaced...