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Hey,

I just finished my ABDX project with the MN3008 chips and MN3101 clock running at approximately 12V.

I have the same problem as murdog47. I got Dry Audio passing but no Delay.
There is signal passing at Pin 7 of IC2 and Pin 7 of IC3 but only a high-pitched whine coming out at Pins 3 and 4 of the Delay IC. The BIAS1 pot seems to have no effect whatsoever.

I'm reading the following Voltages:

IC1 LF353N
Pin 1 -> 6,3V
Pin 2 -> 6,3V
Pin 3 -> 6,3V
Pin 4 -> 0V
Pin 5 -> 6,3V
Pin 6 -> 6,3V
Pin 7 -> 6,3V
Pin 8 -> 12V

IC2 SA571N
Pin 1 -> 1,0V   Pin 9 -> 1,8V
Pin 2 -> 1,8V   Pin 10 -> 4,9V
Pin 3 -> 1,8V   Pin 11 -> 4,9V
Pin 4 -> 0V      Pin 12 -> 1,8V
Pin 5 -> 1,8V   Pin 13 -> 12,4V
Pin 6 -> 1,8V   Pin 14 -> 1,8V
Pin 7 -> 5,2V   Pin 15 -> 1,8V
Pin 8 -> 1,8V   Pin 16 -> 1,0V

IC3 MN3008
Pin 1 -> 11,4V
Pin 2 -> 5,7V
Pin 3 -> 8,8V
Pin 4 -> 8,8V
Pin 5 -> 0V
Pin 6 -> 5,6V
Pin 7 -> 5,3V
Pin 8 -> 10,5V

IC5 MN3101
Pin 1 -> 11,4V
Pin 2 -> 5,6V
Pin 3 -> 0V
Pin 4 -> 5,6V
Pin 5 -> 5,4V
Pin 6 -> 5,7V
Pin 7 -> 5,6V
Pin 8 -> 10,5V

IC6 TL062
unstable except the V+ supply

Could the problem be dead Delay chips? Or could this whine at pins 3 and 4 have another cause?

Greetings Haxman