I don't have any information on this amp but I assume that these are the bias potentiometers. Start with them in the fully counter-clockwise position. All of the transistors must be tightly clamped to the heatsink before you make any adjustments. The power line should have either a current limiter or a 10 amp fuse.
Does your 12v power supply have an amp meter.
Does your 12v power supply have an amp meter.
im using 800a2 schematic and they look to be the same board of 851s, i got the 17v from pin 8 and 4 together of all op amps
i made a mistake the measure was 17v on pin 8 and -17v on pin 4 . now after replace U402 i can get louder but distorted
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