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Re: collective current

is a good term.

The bias has little effect on power, but does affect distortion. B+ voltage affects power output. The amp is speck'ed to make full power (60 watts) into 8 ohms with 120V in (if you are in the US). Generally we do a bit better than that- 65 to 67 watts is common.

A common problem area is the power cord. It is best to run the test with a variac and measure the input AC voltage to make sure there is no sag at full output. Since the amp operates in the A2 window at full output, there can be significant voltage sag in the power cord and the like. It can rob the amp of significant power! If there ever was an argument for upscale power cords and their audibility, this is definately one.

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