[Amps] Vacuum Variable Cap Rebuild

[Jim]

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 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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