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TA-4650 Bias problem on left channel.

B

Beaker22

New Member
I have the left bias voltage at zero and the trim pot has no affect. Right channel is fine.

Paranoid working on it since the v-fet's are not replaceable. Any suggestions?

I did the Diode and resistor upgrade. I did not check the bias prior to the upgrade due to I thought everything was functioning.

I see some crossover distortion on a sine wave but now I need to figure out what the culprit is.

Thanks in advance.

All resistors and diodes checked good on board testing.
 
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