i have few California amps with the same issue -they power on and have good rail and op amp voltages but won't output any good audio .At max gain there is some popping in the speaker .there is no dc on the speaker terminals or on the rca shields .i have 4 of them with the same issue ,but they are free so I'm in no rush
op amp marked Ic104 has 13v on leg 1 the other ones have no voltage on the output.posting few photos if the inside
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