Thank you, Gary! Now I know where I can buy a spare plate choke bypass
capacitor for my homebrew dual-833C linear amp. :-)
73, Mike
www.w0btu.com
On Fri, Dec 28, 2018 at 4:10 PM Gary K9GS <garyk9gs@wi.rr.com> wrote:
> 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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