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Re: [Amps] 2 Section Tune Cap Wanted

To: "'Jim W7RY'" <>
Subject: Re: [Amps] 2 Section Tune Cap Wanted
From: "Jim Garland" <>
Date: Sat, 21 Jun 2014 13:23:29 -0600
List-post: <">>
Hi Jim,
Here's info on an OEP dual section capacitor that is fairly close to your
requirements: p/n 73-2-75-56BE, 2-sections, 17-65 pF and 25-318 pF, with
.075" spacing, nominal rating of 2500V. This is the cap that was used in the
ARD 230CA amplifier, which ran three 3CX800A7 tubes and covered 160m-10m.
You can easily swap plates between the two sections to obtain different
capacitance ranges, so long as the total number of plates remains fixed at
56. The cap measures 2.5in x 2.5 in x 7.25 in, not counting the shaft.  the
"75" in the part number refers to the .075" plate spacing, and if you change
that to, .e.g., 80, it would widen the spacing to .080"  (and of course
change the dimensions). Other spacings are available in the same series.
Jim W8ZR

> -----Original Message-----
> From: Amps [] On Behalf Of Jim W7RY
> Sent: Saturday, June 21, 2014 11:33 AM
> To: AMPS
> Subject: [Amps] 2 Section Tune Cap Wanted
> Now that I have found some 3CX800s and sockets (thanks to the list)!
> I'm looking for a 2 section air variable tuning capacitor like in the
Alpha amplifiers.
> 1 section around 50 pF and the other section 250 to 275pF. I'd even take a
2 capacitors as
> long as I can hook them end to end (larger cap in the front) as seen here:
> Only problem with this is the assembly gets a bit long... So the dual
section would be best.
> I quickly looked on the Oren Elliott page but I don't see any pictures or
values. If someone
> has a part number, I could get one from them.
> Thanks and 73!
> Jim W7RY
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