(1) I think this would be a BAD idea. Some time ago, I bought a bunch of
electrolytic caps to be used in a 3 KV plate power supply. Out of curiosity, I
put some DC across them for a couple of hours and then tested their leakage
resistance. There was a BIG difference, well over a 20:1 ratio. If they had
been put in series without bleeder resistances low enough to "swamp" the
leakages, the voltage drops across the least leaky in the power supply would
have exceeded their ratings by a considerable amount. Wishing to reduce wasted
current, I considered putting bleeders across each that would be "tailored" to
their leakage. After further testing, I saw that they each "aged" at a
different rate, so after a while, some were significantly leakier than others
and the voltage drops across each began to diverge significantly, and I could
not depend on the voltage drops staying under their ratings. So much for that
idea. Use bleeders.
(2) These tubes appeared to have indirectly-heated cathodes. Thorium is put on
the surface of cathodes of tubes (like 3-500Z's and 4-400Z's, also on
consumable electric welding rods) whose filaments are the cathodes; it
increases the filaments' electron emission significantly. It would be without
function on indirectly-heated tubes, and is very unlikely to be put on their
filaments.
(3) Some persons in the "golden ear" high fidelity fraternity claim to be able
to hear differences between "plain ordinary" copper wire and "oxygen free high
conductivity" copper wire. No comment on that. Assuming that there might be
some advantage to such terminals (?!?!?!), I have, ah, further doubts about
whether such a pristine condition would be maintained after one soldered
something to them. My guess is that the author of the ad for those glorious
terminals hadn't the least idea of what he was talking about, and threw it in
as hype.
Gene May
WB8WKU
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