The on on the good channel the voltage started to change about 1/4 of the way. The one on the bad channel the voltage didn't start to move until about 1/2 way.
It seems like the good channel is very sensitive while turning it and the bad one isnt as sensitive.
That could be normal. After it started to increase, did it increase sharply like the other channel and the demo?
That likely means that the problem is in the rectangles or possibly back to the bias transistor but those only very rarely fail.
Is the bad channel distorted the same as it was with the new bias setting?
Set the bias pots fully CCW for further troubleshooting.
Is the bad channel distorted the same as it was with the new bias setting?
Set the bias pots fully CCW for further troubleshooting.
Are the voltage on the collectors of all of the drivers on the two channels equal?
Are the 300 ohm resistors Rx48/Rx49 within tolerance?
Are the 300 ohm resistors Rx48/Rx49 within tolerance?
Something must have shorted. The amp wont turn on anymore. One of the drive transistors shorted?
Power it up through the limiting resistor. Does the voltage increase across the resistor as you try to power the amp up?
Remover B+ and apply remote and ground. Do you read approximately 5v on the gate of every PS FET?
Do any outputs read shorted?
Do any outputs read shorted?
I belive that the outputs on the channel that was good are now shorted. I have them shorted between the left pin to both the others.
Do you read 0 ohms from the gate to other legs for ALL of the FETs on the previously good channel?
From the Gate to the center pin I have:
25.0
38.5
30.8
61.1
61.2
41.5
From the gate to the right pin
25.0
38.8
30.5
61.4
61.5
41.5
25.0
38.5
30.8
61.1
61.2
41.5
From the gate to the right pin
25.0
38.8
30.5
61.4
61.5
41.5