[Amps] AL1500 cooling mod?

[jeremy-ca]

Why would the electrolytics in the AL-1500 require any special airflow since 
they are 105* C computer grade and meant to operate in a warm enviroment? 
You once claimed that those caps were a special order of the highest 
quality.

Amp Supply used the same filters (or a close approximation) and Ive yet to 
hear of a bad one even tho many are over 20 years old.

Carl
KM1H


----- Original Message ----- 
From: "Tom Rauch" <w8ji at contesting.com>
To: <rt_clay at bellsouth.net>
Cc: "Amps Amps" <amps at contesting.com>
Sent: Thursday, September 06, 2007 12:29 PM
Subject: Re: [Amps] AL1500 cooling mod?


>
>> Any opinions on this modification to the AL1500?
>>
>> http://techcomnetworks.com/ve2jka/forum/showthread.php?t=177
>
>
> I certainly would never do that mod. First, that series of
> amps takes cool air in across the electrolytics and then
> across the transformer. His mod will kill the airflow across
> the sensitive electrolytics.
>
> Second the airflow out through just a few top holes will be
> far too restricted. The airflow is already set at the
> minimum possible airflow to keep tube seals below rated
> temperature at the rated duty cycle.
>
> My bet is he never measured anything and is just "guessing"
> things are OK.
>
> 73 Tom
>
>
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