[Amps] AL-572

Peter Frenning, OZ1PIF oz1pif@get2net.dk
Sat, 4 Jan 2003 12:12:42 +0100

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

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

Vy 73 de OZ1PIF, Peter

**********  OZ1PIF **************
email: oz1pif(no-spam-filler)@get2net.dk
Ph. +45 4619 3239
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
----- 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
> 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
> low out here in the country. With only 95 VAC coming in, even if I had one
> those tetrodes with handles  I am reduced to a Mississippi kilowatt (I
> get running - I can hear them coming down the street now!)
> Eric von Valtier K8LV
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> ---
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps