Quote:
Originally Posted by HighGain510
Or you could grab a Weber Bias-Rite tool and do them all at once, without having to pay a tech to do it.  Just have to be REALLY careful when messing around with the inside of the amp, don't want anyone getting friend!  If you're not comfortable doing it I would suggest just paying the tech to handle it for you. 
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I really don't see any way this tool would work with this power amp design. It would give a multimeter the sum of 40X4 milliamps alright, but not the individual power tube's MA. Remember, 4 separate trim pots, not one.