Other channel has only one fet on each bank. And the readings are 6.15mV across resistors.
Fets came with the amp. I did not change. I only changed power supply fets to 3205 and gate resistors to 47ohms.
Pots are still ccw fully.
The FETs came with the amp from the factory? Has someone replaced them previously?
What is the DC voltage on all terminals of both of the voltage regulators?
What is the DC voltage on all terminals of both of the voltage regulators?
Some one changed few and used 540 and 9540 in some places and I took them off.
Lm337
Pin1 -17.9v
Pin2 -24.35v
Pin3 -19.43v
Lm317
pin1 19.5
Pin2 20.76
Pin3 24.12
Does shorting the bias transistors collector to emitter reduce the voltage across the source resistors/idle current draw?
Yes shorting both bias transistors stopping pulling current and coming at 0.8amps. Also if I remove the jumper that you told me on Q11 the amp come back to normal with idle current 0.8amps.
Reduce the value of the 3.65k to about 2.4k (or anything close) to see if that brings the negative regulated voltage closer to 17v.
I used 10k resistor and parallel to the 3.65k now amp is not pulling current and also has the output sinewave with Q11 still with jumper.
That regulator is out of tolerance. The 1.5v between the output and adjust terminals should be 1.25v.
The jumper doesn't disable the output. It switches the output stage on without a delay so you can power up with a limiter without allowing the rail caps to fully charge before it switches on.
The jumper doesn't disable the output. It switches the output stage on without a delay so you can power up with a limiter without allowing the rail caps to fully charge before it switches on.