Do this first (leg trick). Only the K170 thing in the pic.
http://www.diyaudio.com/forums/power-supplies/153484-using-hypnotize-general-shunt-reg-pcb.html
And remeasure.
http://www.diyaudio.com/forums/power-supplies/153484-using-hypnotize-general-shunt-reg-pcb.html
And remeasure.
Yes, and stick it to S pin above board with little solder. Talking for only the one K170 pictured that belongs to the IRP9240s side.
So in the good offset channel its even better but in the bad offset channel its still high. What are the DCV measurements on the power rails now?
OK, much better, keep that mod. But..the main problem was not coming from the rails difference it proves. Now the audio signal JFET pair in the right high offset channel is under suspicion. Maybe one of the two damaged or grossly mismatched. Pull them out and remeasure their IDSS.
The thing is that when the rails are good then only those two are powered by them in the audio path. So they are the ones to check now. Did you measure their IDSS before stuffing them? Because if they were matched, then only soldering too hot could damage one and the offset. One pair in left channel is champ and they use the same power rails...
I can only measure GDS here... Never did measure LDSS and don't know how to 🙂 they were all the same, 132GDS
I have 4 of the A types left from the same batch... so if you can tell me the ones that I need to take out, I'll replace them...
I have 4 of the A types left from the same batch... so if you can tell me the ones that I need to take out, I'll replace them...
The output socket print on the pcb has also R and L printed to its sides. Facing those letters there are the two corresponding JFETS pairs down lower in the PCB.