[Amps] Alpha 76/78 Filter Cap Question

Carl km1h at jeremy.mv.com
Sat Aug 29 11:23:14 PDT 2009


There is no sleeve in my 76PA 3 holer with the original caps and the step 
start R is in line for less than one second.

Carl
KM1H


----- Original Message ----- 
From: "Kevin LaHaie" <klahaie at centricata.com>
To: <Amps at contesting.com>
Sent: Saturday, August 29, 2009 2:10 PM
Subject: Re: [Amps] Alpha 76/78 Filter Cap Question


> Might have answered my own question, what do you guys think?
>
> I think it's for THERMAL reasons, as the step-start resistors (R1 and
> R2) are mounted vertically right behind that rear cap.
>
> Does that make sense - protection from heat in case the step-start fails
> and those resistors turn into toaster elements?
>
> Just a thought!
>
> 73 Kevin K7ZS
>
> Kevin LaHaie wrote:
>> OK, here's another possible trivia question!
>>
>> My Question:
>>
>> There is an additional insulation 'sleeve' around the bottom half of a
>> single capacitor in the 6 cap bank, it's the one that is on the right
>> rear side of the bank (when looking at the amp from the front).  Any
>> photo on the internet will clearly show this 'black' sleeve on the
>> otherwise blue insulation on the Mallory caps.
>>
>> Why is this there?  The caps are sitting on an insulated pad, and don't
>> touch each other.  Hmmmm....
>>
>> Anybody know why?  Mainly curious, it will be replaced during the 
>> 'recap'.
>>
>> 73 Kevin K7ZS
>>
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