[Amps] Hi-Pot testing a tetrode?

[Jim Barber]

I haven't had the privilege of hi-pot testing a tetrode before.

Just based on how they're built, it seems to me that plate to screen 
would be be the most likely thing to test. Comments?

Also, what would be a "good" threshold leakage voltage, as compared to 
the normal plate voltage? Not that I know what I'm talking about, but 
I'm thinking something more than 2.5X the normal plate-cathode difference?

Thanks,
Jim N7CXI