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PPI 2050AM doesn’t pass audio

Amp has good rails and +/-15v for the opamps is also good. Output stage has a few mv of offset, not objectionable. No output though. Probed around on the TL074 and LM833 hoping they were part of the preamp, but found no signal anywhere when the amp is fed a sine wave. Do these have mute circuits? If not, I’ll need a schematic to chase down where I’m losing the signal. Thanks in advance!

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