[Amps] AL-811 & 572's

[Charles Mills]

If you have Greenlee punches, put an 80cfm fan off the side of it to force
air across the tubes and out the top.   Keeps the 811a's nice and cool.  A
friend of mine modded my amp like that for me.

CM

On Fri, Jan 21, 2011 at 1:48 PM, mitch cox <ww4cox at embarqmail.com> wrote:

> With the air flow through an AL-811 I don't think I would push it any
> farther than the factory specs. You have only improved the tubes at this
> point, the puff of air that the factory fan is giving you is not enough to
> keep things cool above these figures and it is doubtful that even at these
> figures the plate transformer and caps would last very long with increased
> stress on the power supply running at a constant state. You would need to
> drastically improve the air flow, which wouldn't take much.
> ----- Original Message -----
> From: "Thomas F. Giella NZ4O" <nz4o at tampabay.rr.com>
> To: "amps @ COL" <amps at contesting.com>
> Sent: Friday, January 21, 2011 12:50:06 PM
> Subject: [Amps] AL-811 & 572's
>
> I have an AL-811 running 572B's instead of 811's. The manual says for RTTY
> mode to use a maximum of 150 ma on the grid and 400 ma on the plate for the
> 811's.
>
> What would be the maximum grid and plate current that I could use on the
> 572B's on RTTY?
>
> 73 & GUD DX,
> Thomas F. Giella, NZ4O
> Lakeland, FL, USA
> nz4o at tampabay.rr.com
>
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>
>
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-- 
=====================================
Charles L. Mills
Westmoreland Co. ARES EC
Amateur Radio Callsign W3YNI
Email: w3yni1 at gmail.com
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