LeeMorgan
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Carver M500T Meters - Repair
KBK
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when meters become old, they can bind from oxidation in their 'needle bearing' mechanisms, which is the type of 'pivot point' that the meters use/have. This is the usual failure point. attempting to repair them can be difficult, but it can be done. The alternative is new meters..which might be tricky to find.

LeeMorgan
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It is not mechanical age, but rather stupid human error (mine, I think). Some years back, I think I mis-calibrated them. It was so long ago, I can't remember what I did. I wish I did...

KBK
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Then it is likely a tech with a scope, signal generator, and load can calibrate the meters to the standard they are meant to be set for. I expect it's peak watts, not RMS average.

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