Component Purpose from schematic

[jeffjmr]

Wondering if some of you with more experience and electronic education than I might take a look at this schematic and tell me what the function of the circled 10k variable resistor is.

This is a plate amplifier for a speaker that has a built-in subwoofer (B&W 605 S2).

I’m guessing it has something to do with standby power on sensitivity; in auto the amp powers up when it senses a signal. But I’d love to know as I have repaired a few of these and bench checked a total of six of them and no two have that VR anywhere near the same setting.

Thanks,
Jeff

[bob91343]

Cannot read, too small.

[oPossum]

I think it is a part of a compression circuit to prevent clipping/distortion. The turn on circuit appears to be top center. It goes to mute and standby inputs of the amps.

[KT88]

agree, it looks like some sort of AGC. The pot sets the gain of the AGC...

[jeffjmr]

That makes sense. Thanks for your responses.

Jeff