What the heck is this button (inside the amp) for?

[Axtman]

I am servicing an Acoustic 370 bass amp head and see this little red button on the output PCB.



Here is the switch (S 301) on the schematic.

[Greg_L]

Circuit breaker?

[Axtman]

It is not a circuit breaker. It is momentary contact. I'll shoot a picture of the underside of the PCB.

[g1]

see note 6 on power amp schematic (AGC defeat for R304 adjust)

[Helmholtz]

see note 1 on power amp schematic

Where?

[g1]

Where?

You caught my error before my edit. The schematic he posted is not the complete schem.

[Helmholtz]

Anyone going to post the complete schematic?

[g1]

see pg.11 of pdf attached

[Helmholtz]

Thanks, makes sense.
Automatic Gain Control (AGC) is typically used for output compression/limiting to avoid hard clipping.

[Axtman]

Oh for crying out loud! As per usual, I saw but I did not see.

Thanks for the clarification G1.