[Amps] Advice

[Carl]

----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Monday, December 07, 2009 12:16 AM
Subject: Re: [Amps] Advice


> ORIGINAL MESSAGE:
>
> On Sun, 6 Dec 2009 17:39:38 -0500, "Gary Schafer" 
> <garyschafer at comcast.net>
> wrote:
>
>>In looking more into other spec sheets it seems the cooling requirements 
>>are
>>all over the place.
>
> REPLY:
>
> Guys, keep in mind the REAL  cooling requirements are based on the 
> temperature
> of the tube seals. How you get there, i.e. the amount of airflow, can vary 
> all
> over the place depending on the physical layout, choice of sockets, 
> altitude
> above sea level, etc, etc.
>
> 73, Bill W6WRT


Some of the cooling specs appear to be highly variable. I suspect that as 
enginnering staff changed and tube application changed the combination 
resulted in different numbers.

In other cases the spec was written for CCS worse case wheras in ham CW/SSB 
use the seal temperature caveat was used fo CYA. This leads to a lot of 
guessing for home brew especially when temperature testing is not done.

Carl
KM1H


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