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Re: [Amps] SB-220 Plate Tuning Capacitor

To: craxd1@verizon.net, amps@contesting.com
Subject: Re: [Amps] SB-220 Plate Tuning Capacitor
From: gudguyham@aol.com
Date: Mon, 05 Jun 2006 09:56:43 -0400
List-post: <mailto:amps@contesting.com>
I stand to be corrected, I never measured them.  Now that I think about it I do 
recall some being a little longer in length but I did not think it was because 
they increased the plate spacing.  I apologize.  Louie 
 
-----Original Message-----
From: Will Matney <craxd1@verizon.net>
To: amps@contesting.com
Sent: Sat, 3 Jun 2006 21:57:20 -0400
Subject: Re: [Amps] SB-220 Plate Tuning Capacitor


Bud,

You gave very good info by reposting the old article with the part numbers. An 
OEP number is an Oren Elliott part number (OEP 26-164) which can be had by 
contacting them. They can reproduce this part or recommend a stock replacement. 
They will sell single parts.

http://www.orenelliottproducts.com/

Best,

Will


*********** REPLY SEPARATOR  ***********

On 6/3/06 at 11:55 PM W2RU - Bud Hippisley wrote:

>W7RY wrote:
>> The very late SB-220s and HL-2200s had longer tune caps. Or Heathkit
>> made them available on a replacement basis. I have seen several SB-220s
>> with them.
>>   
>"LOU" wrote:
>> OF THE DOZENS I HAVE SEEN INCLUDING HL-2200'S THIS WAS NOT THE CASE
>> ALTHOUGH I NEVER TOOK MEASUREMENTS MY FEELING IS THEY WERE ALL THE SAME.
>>   
>
>In late 1987 or early 1988, after some months of frequent arcing at my 
>SB-220 plate tuning capacitor (stock P/N 26-131), I ordered a 
>replacement from Heath.  In return I received P/N 26-164 and a service 
>bulletin page from Heath Zenith that stated, in part:
>
>"A new tuning capacitor, Part # 26-164, is being supplied in place of 
>part #26-131 that you ordered.  The new tuning capacitor is about 1-1/2" 
>longer than the older one, so it is necessary to install a spacer at 
>"DA" to permit proper mounting at the plate coil...."
>
>I installed this capacitor on February 7, 1988.
>
>A Google search on "Heath SB-220 26-164" (without the quotation marks) 
>led me to the following from a July 1997 posting by KM1H to the Amps 
>archives:
>
>"9. Most SB-220's and early 221's will have the small Johnson 154-9 Tune
>cap or the OEP  26-131. This cap is prone to arcing since it is only
>.075"/3KV spacing. Later amps and Heath replacements were the OEP 26-164
>which is about .090/3500V spacing. It will still arc on occasion when the
>amp is mistuned but not melt down as did the original. There is no
>Johnson/Cardwell equivalent. If there is enough interest I will have the
>26-164 reproduced."
>
>I hope the above is adequate documentation of the facts concerning the
>SB-220 Tune capacitor.
>
>Bud, W2RU 
>
>
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