[Amps] AL-811 & 572's

[mitch cox]

Something like this works great with a fan from an AL80B. 
----- Original Message ----- 
From: "Charles Mills" <w3yni1 at gmail.com> 
To: "mitch cox" <ww4cox at embarqmail.com> 
Cc: "Thomas F. Giella NZ4O" <nz4o at tampabay.rr.com>, "amps @ COL" <amps at 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 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 

NZ4O Solar Space Weather And Geomagnetic Data Archive: http://www.nz4o.org 
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-- 
===================================== 
Charles L. Mills 
Westmoreland Co. ARES EC 
Amateur Radio Callsign W3YNI 
Email: w3yni1 at gmail.com 
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