[Amps] Vacuum Variable Cap Rebuild

[Alek Petkovic]

Dr Alex, ur4ll.net, has a 1200pF one for US$135.00

73, Alek, VK6APK

On 11/04/2021 7:33 am, Larry via Amps wrote:
> you could try ECONCO. they rebuild Eimac tubes. the cost would probably be more than the used value of the vacuum cap.
> larry
>
>
> -----Original Message-----
> From: Paul Christensen <w9ac at arrl.net>
> To: amps at contesting.com
> Sent: Sat, Apr 10, 2021 10:47 pm
> Subject: [Amps] Vacuum Variable Cap Rebuild
>
> Anyone know if it's possible to rebuild a vacuum variable cap?  It would
> require a precision break of the seals, then evacuating the air with a new
> seal.
>
> A cap used on my 160m transmit "T" failed a few months ago.  While
> dismantling the antenna at the season's end, I brought the cap back home and
> purchased a Megger 230425 Hi-Pot test set.  After testing today, the cap
> repeatedly breaks down at 700V, although it's rated for 5KV.
>
> It would be a shame to discard; it's an expensive Jennings ceramic type with
> a range of 25-5000 pF.  Used, they're $1,500 ea. from MaxGain Systems.  I
> only need a range to about 1200 pF, so I can definitely get by with an
> alternate that's on the shelf.  That's not the issue.  I would like to save
> the cap if possible.  I'm not sure what conglomerate owns Jennings now but I
> doubt they would have a rebuild service when it's much more profitable to
> sell new caps.
>
> Paul, W9AC
>
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