Agreed. If you truly want +/- 5% RMS to save your tube filaments,
(that's the critical thing) your typical cheap VOM does not measure RMS
and is not too accurate at what it does measure.
Fortunately, my amp PS doesn't have any taps, so I don't have to worry.
My policy is not to turn the thing on very often. ;-)
73 Martin AA6E
Jim Jarvis wrote:
> TT:
>
...
>
> The DMM he's using probably has an AC accuracy of +/- 3-5%.
> That is, +/- 7-12V error @ 240V. We're discussing power grid variations
> of between 0.8 and 3%.... Anybody see a disconnect here?
>
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