[Johnson] High Voltage Electrolytic Capacitors

[Larry Knapp]

Bill - I have replaced capacitors in several HO-10's and SB-610's.  In some
cases I will parallel them.  The newer capacitors are smaller and will fit when
paralleled.

Try the following link...they have 630 and 1000 and even some 1600 volt
cpacitors.  Mouser may also have hi voltage capacitors.

http://www.justradios.com/MPMcapacitors.html

Best 73, Larry KC8JX

--- Bill Evans <bevans at ebsys.mb.ca> wrote:

> While this problem is not pertinent to Johnson equipment ... yet... I have
> several Rangers and the issue is pertinent to all Boatanchor gear.
> 
> 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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