>Rich, the EFJ T-bolt (2 x 4-400's) is grid-driven and set up for only about
>20W drive to run 1kW DC input. If the HV is increased much above 2200V, the
>filter cap will definitely require replacement, I'm reasonably sure it's
>only a 2500V cap, and the original was oil-filled with lots of nasty stuff,
>circa 1958 or so...
>
// Not all oil-filled capacitors in days of yore used PCBs. General
Electric's "Pyranol" caps did. Sprague "Vitamin Q" caps did not. Also,
capacitor ratings then tended to be conservative. For example, a
"Vitamin-Q", 600v-rated, 4uF capacitor fails at c. 3500v. I ran some at
1700v for years in a UHF amplifier and they are still good.
cheers, Steve. Tnx
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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