I may have to stand corrected here....
My personal experience is limited to the Svetlana brand mounted in an
FL-2000B, which, even with the Svetlana mod, was a less than satisfactory
experience. I was never able to get more than 300W on 10m, and the one time
I really tried to tickle more than than out of the beast, it cost me an
almighty bang and two broken tubes! I have now modified the amp to use a
single QB4/1100 (or QB3.5/750) which is a tetrode very similar to the 500Z,
in GG service. The amp will now deliver more than 650W on 80m and ~550W on
10m, in addition to being a lot easier to tune. See full story on my
homepage!
I have heard the same experience from other users of amp with the 572B
(mostly SB-2xx), but, as stated above, I'm willing to yeild to higher
expertise.
Vy 73 de OZ1PIF, Peter
********** OZ1PIF **************
email: oz1pif(no-spam-filler)@get2net.dk
http://hjem.get2net.dk/oz1pif
Ph. +45 4619 3239
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************
----- Original Message -----
From: <MorgusMagnificen@aol.com>
To: <oz1pif@get2net.dk>; <amps@contesting.com>
Sent: Saturday, January 04, 2003 2:14 AM
Subject: Re: [Amps] AL-572
> Your comments about the 572 do not seem correct. What is the basis for
your
> belief that they are inferior at 30MHZ?
>
> I have used 4 572's in my amplifier for several years, using virtually all
> known species, including the overrated and overpriced SV572. I have no
> problem getting full KW out on all bands - except when the line voltage
gets
> low out here in the country. With only 95 VAC coming in, even if I had one
of
> those tetrodes with handles I am reduced to a Mississippi kilowatt (I
better
> get running - I can hear them coming down the street now!)
>
> Eric von Valtier K8LV
>
>
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