[Johnson] High Voltage Electrolytic Capacitors

[Jim Brannigan]

I got mine from Mouser..........
I think they were less than $1 each......

Jim


My Heathkit SB-610 monitor oscilloscope, built in the mid-to-late 1970’s,
recently stopped working and I determined that a shorted capacitor in the
CRT HV supply was the culprit. There are two 0.15 micro Ferad tubular
electrolytics, rated at 1600 WVDC, used in a voltage doubler to supply the
monitor CRT. The capacitors are in a plastic package of modest size and
likely cost, at most, a couple of dollars each at the time when I built the
kit.

Searching amongst various parts suppliers, including catalogue houses,
reveals an absence of high voltage tubular electrolytic capacitors. I had
recognized from Electric Radio Magazine that it was tough to find many of
the metal electrolytics for various boatanchor transmitters, but didn’t
think that this problem extended to HV electrolytics of all types.

I finally located a manufacturer of plastic tubular capacitors meeting the
requirements, whose Canadian rep quoted me a price of $64.00 for a single
replacement unit.

Having recovered from the shock sufficiently to post this information
request, can someone suggest sources of supply for these types of
capacitors, which were at least as common as vacuum tubes just 20 years ago?
Tubes we can still get.

Bill Evans
VE4UD
Winnipeg, Manitoba, Canada
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