Quote:
Originally Posted by madlabs
Although it says on the schematic not measure between 5 and the HV output, it gives an expected measurement of 385 ohms. I figured that the do not measure was for older VTVM's, so I checked it anyway, 366 ohms. So the top coil seems good, lower coil a little low in resistance. Shorted turns? When we pulled the HV rectifier tube, it was completely cool to the touch. With the really low filament voltage I am not sure how warm it should be.
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I'm pretty sure that warning means not to measure the voltage with the set powered up, because of the presence of high voltage spikes. There should be no harm in measuring the DC resistance when the set is powered down.