[Elecraft] OT - Source for Air Variable Capacitors

[Josh Fiden]

These look interesting & $38 incl shipping. I'd be inclined to check this out before MFJ..

https://m.ebay.com/itm/High-Voltage-Air-Variable-Capacitors-20-95pF-Amplifier-Tuner-REPAIR-DIY-/161247381436

73
Josh W6XU

Sent from my mobile device

> On Jun 16, 2018, at 7:34 PM, K9MA <k9ma at sdellington.us> wrote:
> 
> I searched far and wide for high voltage air variables a year or so ago for a tuner.  I needed some quite specific values rated up to about 1 kV.  The only place I could find them was Surplus Sales of Nebraska.  They weren't cheap.
> 
> 73,
> Scott K9MA
> 
> 
>> On 6/16/2018 20:30, rich hurd WC3T wrote:
>> I bought a Cardwell 500PF 3.5KV on eBay last year.  As a bonus I discovered
>> that it had a reduction drive when I opened the box.  :)
>> 
>> Not sure if it fits your requirements - it's pretty ratty looking, and was
>> obviously pulled from some electronic equipment.   I sort of resigned
>> myself to needing to 'spiff it up'.
>> 
>> Keep your eyes open on eBay, that's the best advice I can offer.
>> 
>>> On Sat, Jun 16, 2018 at 8:05 PM Dauer, Edward <edauer at law.du.edu> wrote:
>>> 
>>> With the tutelage of a friend I am putting together a mag loop but have
>>> had no luck finding a source of air variable capacitors up to the task.
>>> Vacuum variables aren’t hard to find, but the $200 and up price tag is
>>> offputting.  I have seen a couple of AVCs on E-bay that looked pretty
>>> ratty; and the commercial types for sale new look like low-power trimmers.
>>> Anyone know of a source --  or even have any they’d sell?  Specifically I
>>> would like a range of 6 to 120 pf or more, butterfly or split stator, with
>>> plate spacing sufficient to take a kilovolt of RF.  And ideally with
>>> reduction gear tuning though that’s optional.
>>> 
>>> Thanks for any info anyone can provide . . .
>>> 
>>> Ted, KN1CBR
>>> 
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> 
> -- 
> Scott  K9MA
> 
> k9ma at sdellington.us
> 
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