Something like this works great with a fan from an AL80B.
----- Original Message -----
From: "Charles Mills" <w3yni1@gmail.com>
To: "mitch cox" <ww4cox@embarqmail.com>
Cc: "Thomas F. Giella NZ4O" <nz4o@tampabay.rr.com>, "amps @ COL"
<amps@contesting.com>
Sent: Friday, January 21, 2011 1:50:46 PM
Subject: Re: [Amps] AL-811 & 572's
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@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@tampabay.rr.com >
To: "amps @ COL" < amps@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@tampabay.rr.com
NZ4O Solar Space Weather And Geomagnetic Data Archive: http://www.nz4o.org
NZ4O Daily LF/MF/HF/6M Radiowave Propagation Forecast:
http://www.solarcycle24.org
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Charles L. Mills
Westmoreland Co. ARES EC
Amateur Radio Callsign W3YNI
Email: w3yni1@gmail.com
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