Re: [Amps] Vacuum Variable Cap Rebuild

[Jim <jimw7ry@gmail.com>]

There you go!

Thanks
73
Jim W7RY

On 4/10/2021 6:49 PM, Alek Petkovic wrote:
> 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@arrl.net>
> > To: amps@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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