Let's forget about class C since that's a distraction. You will
certainly have an RF v. swing well above the plate supply voltage.
Most hams who build amps and use v.v. caps for tuning just find one a
few thousand volts above the dc supply voltage and move on. Most of
us aren't engineers; I am certainly not. If ur supply is 2.5 or 3 KV
use a 5 or 6 KV cap. If it's 6 KV use a 10 KV cap and so on. If you
have a 3 KV supply and a 3 KV cap it may very well arc over. If it's
5 KV and it arcs it likely has a leak. Are there any 3 KV v.v. caps?
The ones I come across are all well above that, because the whole
point is to have high voltage rating and wide range in a small space.
Bread slicers that have a lot of range and voltage rating are huge.
You can get out the books and start calculating what your peak RF v.
is the way an engineer would, and I admire that, and maybe many on
this email list can do it; I lack the patience and time myself so as a
ham, I'll just find a cap a few thousand volts above dc supply, put it
in and cross my fingers, hi. Of course that may mean spending more
money than I need to. From a company bean counter's viewpoint, the
main point of engineers in product design is to minimize costs.
73
Rob
K5UJ
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