[Elecraft] OT - Source for Air Variable Capacitors
Walter Underwood
wunder at wunderwood.org
Sat Jun 16 22:33:43 EDT 2018
MFJ sells butterfly capacitors. They are rated at 1.5 kV.
12-67 pF http://www.mfjenterprises.com/Product.php?productid=MFJ-19
18-136 pF https://www.mfjenterprises.com/Product.php?productid=MFJ-23
wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)
> On Jun 16, 2018, at 5:05 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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