The useful answer is that the 572B works very well at 6M and a SB-200 works
very well there also if you understand amplifiers. No rocket science
required.
Carl
KM1H
----- Original Message -----
From: "c.s." <carlseye@verizon.net>
To: <amps@contesting.com>
Sent: Monday, September 24, 2007 5:27 PM
Subject: [Amps] 6 mtrs:
> I have been seeing several messages here lately relating to 6 mtr.
> conversions of SB200 type amps to 6 mtrs . using (purportedly) 572B type
> tubes.!!! This may very well be as advertised, BUT, I am Very curious as
> to HOW the tubes that are advertised as being good only to 30 mcs.
> (oop-s) 30 mhz. are being "coerced" into working at 6 mtrs.!!!!
> I'm not the world's greatest at this stuff ( any more) , But it
> is indeed very interesting to know how all this is happening.!!! I'm
> sure there are those among us who wonder how this is being
> accomplished.!!!!
> If those who know are afraid to tell us ( meatheads?) it doesn't
> seem to me that they are indeed "Hams" in the purest sense of the
> word.!!!!! If they are NOT hams , they seemining don't belong on this
> list.!!!!!
> I for one have many problems with the SB200's ( 572B's) even at
> 30 mcs(oops) 30 mhz!!! The stability of an SB 200 is in my mind, at
> least questionable at 30 MHZ.!!!!!!!
> At least that is what I've run into , and I have never (that I
> can recall) had any useful answers, Though I've asked before.!!!
> Anybody involved got any useful answers????????????
> carl / kz5ca
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