Re: Testing 813's.
With winding voltages up to 195, then 1N4007 diodes will be plenty.
I tested high voltage diodes by connecting then to a 1kV supply and then measuring the leakage with an analog meter set to the 1kV range. I subtract reading from 1kV to measure the voltage that the diode can withstand. This seemed to work well with a fistful of surplus diodes bought many years ago. I now use modern diodes as they are so cheap and work without testing.
My limited experience is that possibly faulty diodes are either good or bad as measured with low voltage.
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