Signal trace the input stage with 40hz tone to see if the signal is interrupted.
Ignore the following comment. This doesn't apply to the 600.1 only the 300.1
Also check the two 1 ohm 2512's near the regulators
The voltages look good.
RCA shield is a good reference for signal trace.
You have 40hz through U2 and U7-Pins 3,5-input, Pins 5,7 output, correct? Pins 4 & 8 are operating voltages +/-15 volts.
Check Vdc around IC7 referenced to power ground and post. If =/-15v is missing at Pins 8 & 4 check Vdc on either side of R10 & R14-10 ohm resistors.
RCA shield is a good reference for signal trace.
You have 40hz through U2 and U7-Pins 3,5-input, Pins 5,7 output, correct? Pins 4 & 8 are operating voltages +/-15 volts.
Check Vdc around IC7 referenced to power ground and post. If =/-15v is missing at Pins 8 & 4 check Vdc on either side of R10 & R14-10 ohm resistors.
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