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In Reply to: RE: ok, what is happening here???? posted by cpotl on December 03, 2016 at 12:35:11
Chris is correct: the scope is showing peak to peak voltage not RMS - my post below is incorrect with respect to the voltages.If you divide peak to peak in 2 you get the peak voltage and this is accurate for a square wave. If the wave is more of a sine you need to divide by two to get the peak and multiply by .707 to get the true RMS voltage. As Chris says, this is unloaded and you should put a proper load on it to determine the net voltage.
Edits: 12/03/16Follow Ups:
Actually, I guess I could hook it to the filaments of a 813 as they draws 5 amps and they are what I want to use these on and I would be using one per 813.
Edits: 12/03/16
What would a proper load be? I think the 12sn7 filament draws about 0.3 amps. Is that enough?
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