Hi Dave,
Take a look here:
https://www.alpharfsystems.com/?s=75+pF&submit=Search
They have both the individual caps, now 18 kV, and the 5 capacitor assembly.
Good luck
73,
Gary K9GS
-------- Original message --------From: daraymond@iowatelecom.net Date:
12/28/18 3:16 PM (GMT-06:00) To: topband@contesting.com Subject: Topband:
Need for capacitor
Greetings topbanders. . .
While CQing early this morning I began noticing a faint but troubling smell in
the shack. It smelled like over heated wiring or electrical components. It
continued to get stronger as I realized the odor was coming from the Alpha 99
amp. Indeed, a few moments later it tripped out. I dug into it this afternoon
and discovered a leaky 75 pF/6 kV cap which is one of five such caps in a
parallel bank that is pulled in on the band switch to achieve tank resonance
only on 160m. I have removed the bad cap making the amp operational once again
with the air variable tuning cap making up the lost C (and there’s still a
little C to spare on the air-variable). After some searching I cannot find a
75 pF/6 kV cap. Mouser does not have anything even close in terms of the high
voltage rating (hopefully I didn’t something). The closet thing Newark has is
47 pF which I have ordered. I’m guessing the 47 pF is probably OK but how
important is equal current distribution across the five caps? Maybe I don’t
need to be concerned about it? If I really do need the correct 75 pF/6 kV cap
does anyone have ideas of a source? Replying privately is fine. See you
all in the Stew. 73. . .Dave, W0FLS
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