Ignoramus6399 wrote:
I have a bunch of 1N4007 diodes (1000v rated). If I put, say, 20 of
them in series, would that be sufficient to rectify 9,000 VAC safely?
I have read some articles discussing that since leakage amps are not
identical, that I need to put resistors in parallel with them. If so,
these need to also be 1kV rated resistors, right?

If not, would anyone have a suggestion for a 30 mA rectifier for 9
kVAC?

According to http://www.pupman.com/listarchives/1.../msg00143.html
"Use a MOT diode: typically they are 9kV 450mA and very cheap."
Apparently MOT means microwave oven transformer. Note, the 9kV RMS
AC of your Franceformer presumably peaks at about 13kV, so you would
need a variac on its input if using a single 9 kV diode. Also see
http://www.pupman.com/listarchives/1.../msg00309.html in same
thread, which implies that obvious tubes like 1B3 won't handle 30 mA.

-jiw