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@sbcglobal.net> wrote:
From: Hector Garcia XE2K <j_hector_garcia@sbcglobal.net>
Subject: [Amps] AL-811H with 572's question
To: amps@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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