[Amps] 2 Section Tune Cap Wanted

[Carl]

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 at 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 at 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
>> _______________________________________________
>> Amps mailing list
>> Amps at contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
> -----
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2014.0.4592 / Virus Database: 3972/7731 - Release Date: 06/23/14
>