Pass Labs xa - .5 amps

Hi Tvad, I have small doubt on the meter in front side.
My previous amp xa 60 needle was staybale but xa 30.5 needle always moving around, why? secondly this amp is not single ended class a? can you please clear my doubts?

I don't believe the XA-.5 series are single ended Class A. There are very few single ended Class a solid state amps. I believe the First Watt is one.

Here's a white paper about Single Ended Class A written by Nelson Pass, the designer of the First Watt.

I think if the A-30.5 needle is moving around that you might be exceeding it's power limits. Not sure, though. You should contact your dealer for further info.

Seems to me that Audiofeil might be in the position to offer the best advise on this one.

Unlike most amplifiers the meter staff on the XA.5 series indicates bias, not power.

It will move only when the amplifier exceeds its' rated output.

Dealer disclaimer.

I would imagine it would tend to exceed its rated power on peaks, which can happen often. Is it necessarily a bad thing that the meter moves, or is that to be expected with music dynamics and nothing to worry about if everything sound fine?