Black meter probe on RCA shields or one of the non-bridging speaker wires for all.
The center legs or the tabs of the rectifiers will have rail voltage.
Pins 4 and 8 on the op-amps are regulated voltage. All should read the same so only post the voltage you read on any of the op-amps.
The center legs or the tabs of the rectifiers will have rail voltage.
Pins 4 and 8 on the op-amps are regulated voltage. All should read the same so only post the voltage you read on any of the op-amps.
Can you get more DC input voltage? 13.5v?
If not...
Gain at max
Both muting transistors out
Drive a test tone at level that will produce about 10v at the speaker wires.
Confirm that both channels are relatively close.
Reinstall ONE muting transistor and after leg 3 goes the lowest, drive the same signal into the amp.
What is the difference in the two channels?
If not...
Gain at max
Both muting transistors out
Drive a test tone at level that will produce about 10v at the speaker wires.
Confirm that both channels are relatively close.
Reinstall ONE muting transistor and after leg 3 goes the lowest, drive the same signal into the amp.
What is the difference in the two channels?
No, I have no way of getting more DC input voltage. A 12 volt power supply is all I have.
Both muting resistors out and driving a test tone as close to 10v at the speaker wires as I could get, yielded the following results:
Right channel - 12.85v
Left channel - 11.62v
Do you still want me to proceed with reinstalling one muting resistor and performing that test?
Both muting resistors out and driving a test tone as close to 10v at the speaker wires as I could get, yielded the following results:
Right channel - 12.85v
Left channel - 11.62v
Do you still want me to proceed with reinstalling one muting resistor and performing that test?
I removed the transistor next to it. I'm assuming by asking me if it changes the mute delay, you the meant for me then to re-run the tone output test...
I ran it three times with the following results:
1st test -55 seconds
2nd test - 1 minute 45 seconds
3rd test - 1 minute 15 seconds
I ran it three times with the following results:
1st test -55 seconds
2nd test - 1 minute 45 seconds
3rd test - 1 minute 15 seconds
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