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sip cards both cards have 100 ohms on the 1st and last pins to the pin 1 of the 722 and 723. 53v rail voltage on outputs. Amp is pulling 1.5 amps or so at idle. dc offset is 3mv both channels which seems different than it used to act. everything seems ok but has virtually no output on either channel. If I put a 1k test tone to it and turn the gain up I can barely hear it. scope just shows weird artifacts when testing the outputs. at a loss what it might be. Any help would be appreciated. thanks