[Akku]

It was working flawlessly but testing the current through R9 to set the bias for class A operation (I finally get the correct resistor value) I shorted something with the multimeter.
Now no sound at all, it is like dead not even a hum.
I guess there is some problem with the op-amp's power supply section. I get only few volts from the power rails for the op-amps (1,3-1,4) and exactly the same dc offset at the output but negative! Between R9 now I have only 0.01 mA, before it was 1,1.
Do I have to desolder and substitute all the active elements of the amp?
Thank you

 

[blipblop]

That blows. You were properly using the multimeter, or did the short come from accidentally touching something next to it?

 

[ppl]

Quote:

Originally posted by Akku It was working flawlessly but testing the current through R9 to set the bias for class A operation (I finally get the correct resistor value) I shorted something with the multimeter. Now no sound at all, it is like dead not even a hum. I guess there is some problem with the op-amp's power supply section. I get only few volts from the power rails for the op-amps (1,3-1,4) and exactly the same dc offset at the output but negative! Between R9 now I have only 0.01 mA, before it was 1,1. Do I have to desolder and substitute all the active elements of the amp? Thank you

Replace the all the FET transistors. the op amp and tle should still be good but thay also could have fried

 

[Akku]

blipblop:

Yes, I touched something accidentally. The buffers high current supply, I guess.

PPA:

I though about that. What It seems strange to me: all the three channels at the same time? I did something wrong in the left one. Let's hope op-amps are still alive.
Thank you.

 

[Gariver]

Hey, Akku! Good luck to you! I hope you get past this downer soon!

 

[blipblop]

Hey, I agree. I just had a snafu with my PIMETA, and the ****ty feelings that develops at the base of your stomach, anticipating the nasty road of troubleshooting, is THE WORST.

I hope you find the answer as quickly as I did.

 

[Akku]

Thank you, my friends, for your understanding. It is not actually a troubleshooting or debugging but something like a rebulding

I desoldered all the jfets - as PPA advised - and I hope to get a new set tomorrow. Let's hope for the best.