[Amps] 3CX800 and blower

[Alex Eban]

I can concure with that.
If Eimac says it's not recommended it means NO
Alex	3Z5KS

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Don Kessler
Sent: Monday, September 07, 2009 8:09 PM
To: amps at contesting.com
Subject: Re: [Amps] 3CX800 and blower

On Monday 07 September 2009 10:26:42 am David J Windisch wrote:
> Does a 3CX800A7 require airflow any time the filament is lit, like, say,
> 3-500Z glass tubes with tender seals and 70-watt filaments?
>
> I'm thinking of leaving the (unobtanium) blower turned off, to lower wear
> and tear, until I need the power.
>
> Yep, I'm aware of the potential hazard of a senior moment: I have in mind
a
> no-blower-no-operate interlock scheme.
>
> Tia & brgds,
> Dave, W8FGX
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> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps

According to the data sheet for this tube and from talking to the folks at
CPI 
(Eimac) directly, forced air cooling is absolutely mandatory whenever
current 
is applied to the filament.  

I know from personal experience that a few minutes of filament heating
without 
forced air cooling makes the tube very hot to the touch.  It is easy to 
believe that the seals would overheat if this condition were permitted to 
continue for greater lengths of time.

I would much prefer to replacement worn out blower than to replace the 
tube(s).

73,
Don
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