[Amps] plate bypass caps

[Steve Flood]

I have quite a few of the old-style transmitting mica caps (C-D, Sangamo, 
Solar, etc.).  Are these okay to use in a nearly-legal-limit amp for either 
plate-choke bypassing, or antenna load padders?  Some of these are marked 
for 2500 working volts.  I don't have a hi-pot to check them out (that's 
another project in the que).

RF Parts carries them - they are items CM45, CM55, CM60 on their "Mica Cap 
Comparison" link.

My setup is 2700v B+, plate load about 2500 ohms.  The PI-EL program shows 
about 420 volts and 7 amps at the antenna load variable cap.  In case I need 
a little less loading om 160m, I'd like to pad it with 500pF.

Steve KK7UV