Hi Rich,
Trying to not split hairs here:
I should have said "at the onset of observable leakage" in stead of simply
"leakage".
My definition of leakage is when it just begins to show some current on a 60
microampere dc meter at the stated voltage. The VOM is on the 6kv dc scale
and in series with the high voltage tester to provide approx 120 megohms series
resistance to limit current in case of a breakdown.
To be totally correct the voltmeter reading must be subtracted from the dc
voltage at the high voltage tester output terminals.
If I can't see any movement of the 60 microampere meter then I call that
zero leakage. As you said though, there is always some leakage as the
insulation
between the plate and grid, while very, very good, it is not perfect;
especially if the tube was handled without wearing good gloves.
Did I leave out anything?
73,
Gerald/K5GW
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