Re: [Amps] 2 Section Tune Cap Wanted

["Carl" <km1h@jeremy.mv.com>]

As with all OEP 73 series caps there are 3 different current handling 
versions; the cheapest is not the best and the highest isnt necessary.
I have the original Alpha built by Cardwell 154-10-53 cap here, as used in 
the Model 86 and all other Alpha dual 3CX800 amps, never used and last one 
left.
Sections are 7-60pf  and 15-210 pf (200 on the schematics) It has three 
heavy duty wipers as shown in the manual. Dimensions are the same as the OEP 
mentioned and I dont see how they came up with those values as I sold the 
OEP version thru Radiokit back then and it was the values I quoted for the 
Cardwell.
Carl
KM1H


> Thanks Jim!
>
> I emailed them and they answered right back!
>
> They are $129.00 each in lots of 1 for the "75". 4 week delivery.
> That will fit the bill exactly!
>
> I've had several ARD230 amps, but only the ones with 2 tubes.
>
>
> Thanks for the tip!
> 73
> Jim W7RY
>
>
>
> -----Original Message----- 
> From: Jim Garland
> Sent: Saturday, June 21, 2014 12:23 PM
> To: 'Jim W7RY'
> Cc: amps@contesting.com
> Subject: RE: [Amps] 2 Section Tune Cap Wanted
>
> 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.
> 73,
> Jim W8ZR
>
> > -----Original Message-----
> > From: Amps [mailto:amps-bounces@contesting.com] 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:
> http://i900.photobucket.com/albums/ac206/w7ry/3CX800%20Amplifier/DSC_0112.jp
> g
> > 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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> > Amps@contesting.com
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