[Amps] AL-811H with 572's question

[Hal W5GHZ]

Hector,
 
The tuning remains the same due to power supply limitations in the AL-811H.  The advantage of using the 572B's is that the tube is more rugged and will withstand mis-tuning better.  It will also last longer as it will be run below it's rated output.  One might sneak a few more watts out, but you run the risk of burning up the power supply.  The filter capacitor bank is marginal in this amplifier, so I would think the rest of the supply is also marginal.  Tell him to maintain the same plate and grid current limitations and he should never have to replace the tubes.
 
Hal W5GHZ


--- On Sat, 11/27/10, Hector Garcia XE2K <j_hector_garcia at sbcglobal.net> wrote:


From: Hector Garcia XE2K <j_hector_garcia at sbcglobal.net>
Subject: [Amps] AL-811H with 572's question
To: amps at contesting.com
Date: Saturday, November 27, 2010, 12:48 PM


Hi 

A friend of mine just got a 811H with the tubes 572 s( from  RF parts)  some one 
else made the modification and looks that all is working fine, he is very 

obsessive in his things and want to know all to the detail specially in the 
amplifier tuning,    the question is now , the amp was original with 811's  and 
all the tuning and 

the maximum values are for those tubes, with the 572's are the same maximum 
values  to take care when tuning for maximum power?

will appreciate your answer  to pass to him.


J.Hector Garcia  XE2K / AD6D
Mexicali B.C  DM22fp
P.O.Box 73 
El Centro CA 92244-0073
http://xe2k.net
http://dxxe.org
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