Originally posted by TelRay
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It looks like the NFB is working OK.
What was the setting of the Master Vol pot? The CCW end of the MV pot is connected to the NFB input. At low MV settings the feedback signal will add to the input signal. I think that is causing there to be no noticeable change in output when the 820R is disconnected. Check to see if the signal on the MV pot wiper changes when disconnecting the 820R.
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