High volt. cap ?

[Don]

Thanks, Carl and all the others who gave me advice on these. I guess
they were just bad news when they were new. Now I have 3 places to buy
new caps from that will probably do fine service.

Not long ago, someone posted that heath never ever used anything
substandard, and only used the finest components..etc...etc. I replied
to him with a list of things that I had found to be worthless, but I
didnt think about these damn capacitors. I'm sure they are truly rubbish
and were so over the several decades they were used. I'm just glad to
find some sources for real caps to replace them. Thanks, guys!

Still, I wonder what these things are. Are they electrolytic? They have
bands, but no + marks, so I assumed they are not electrolytic, and the
band is just indication of the outside foil for ground shielding
purposes. What is the juice that always seems to be on them? Is the
company that made them still in bussiness and making the same crap? What
kind of oil is in them? maybe pcb? what are the plates made of?

Dont knock yourselves out, but I am just curious what these are and how
heath ever came to use them. I havent seen them in anything else, though
one person said collins and others used them. I have lots of old collins
equip  and none of it has these "black beauties" in them. Seems like
they appear in anything heath ever made that used more than a few
hundred volts.

Don


Carl Hyde wrote:
>
> Hi Don.  These are infamously referred too as "Black Beauties".  They were
> used by Collins, Heath and Halli and they are junk.  Replace them all as a
> matter of course because they all leak and they all fail.  They can be
> easily replaced with Sprague, Orange Drop caps available from surplus sales
> of nebraska or antique radio supply.  Don't even try to replace them with
> originals.  AES catalogue can be had from (800 706-6789)
>
> Don wrote:
>
> > I'm wondering about those black caps that heath used in most crt supply
> > circuits. Lots of 1200v and 3000v. Some were marked accushnet. I have
> > never seen a used one that didnt have some kind of juice on them. Is
> > this leakage? maybe oil filled. If its something leaking, should they be
> > replaced? Does anybody know a source for these, perhaps higher quality
> > than the original? I have some that are .5 Uf at 1200 v, about 2 1/2
> > inch long, 1" dia. and some that are .015 3kv that are much smaller.
> >
> > Thanks,
> >
> > Don
> >
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> --
> Carl Hyde
> carl.s.hyde at lmco.com
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>
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