[Amps] Can I cool too much the tubes?

[Carl]

----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Wednesday, August 18, 2010 2:27 PM
Subject: Re: [Amps] Can I cool too much the tubes?


> ORIGINAL MESSAGE:
>
> On Wed, 18 Aug 2010 12:22:23 -0500, Rob Atkinson
> <ranchorobbo at gmail.com> wrote:
>
>>
>>For how long at 1500 w.?
>
> REPLY:
>
> As far as I know, that's for continuous operation, however the Eimac
> sheet for the 3-500Z does say that increasing airflow beyond the
> minimum will prolong tube life. Doesn't give any numbers.
>
> 73, Bill W6WRT
>

Forced air cooling requirements are listed at specific backpressures and the 
use of pressurized input, chimneys and squirrel cage blowers who are also 
back pressure rated.

Simple fans are rated at no backpressure.  It is not a simple either-or 
comparison.

Carl
KM1H