It does seem like Q1, T1, T2 are working. Now, the signal stops at C10 (10u). I replaced the cap, and still no luck. This is C9 in the original Fishman circuit post #1. Polarity is the same. What would prevent an AC signal from traveling through an electrolytic capacitor?

Here's a related thread about audio through electrolytic caps.

 

You've STILL got D2 the wrong way round.

 

You've STILL got D2 the wrong way round.

Ah yeah, sorry. I haven't updated the schematic yet. But I don't have D1, D2 installed in my PCB prototype, it wasn't in the original Fishman circuit.

 

Ah yeah, sorry. I haven't updated the schematic yet. But I don't have D1, D2 installed in my PCB prototype, it wasn't in the original Fishman circuit.

R9 is connected to the wrong place. As it’s a Sallen & Key high-pass filter, it should go to the op-amp output not the inverting input, but I doubt that would stop it working.

 

that should not be the issue. it matches original.
since signal does reach C10, problem is after it which is only few parts.
i notice that max gain is half compared to original due to different potentiometer value (50k vs. 100k).
the only way for signal to not pass though is if :
R12 is open / cold solder
R13 is open / cold solder
IC1.2 is not working or there is a short between pins 6 and 5

 

and while D1 and D2 are not installed and D2 is still oriented incorrectly, the symbols for D1 and D2 are also wrong. those diodes are not Zeners

 

D1 and D2 should now be correct.

 

I'm gonna start a new thread, because this isn't about transistors anymore. Thanks for the help!

Prototype PCB troubleshooting - Audio preamp | All About Circuits

 

Back to the diodes D1 and D2. These aren't in the original circuit (see post #1). What is their function? Are they necessary?

 

They protect the JFET from ESD hits which are a common happening with guitar 1/4" jacks.
Static electricity killing guitar electronics is common without them. 12AX7 don't mind lol.