Topband: Need for capacitor

[Gary K9GS]

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 at iowatelecom.net Date: 12/28/18  3:16 PM  (GMT-06:00) To: topband at 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
_________________
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector