If its repeatable it is called engineering. If it works once and then you
write an article about how smart you are that is called something else.
I see that the Ameritron AL-572 that you may have worked on required
neutraliztion. Looks to be a copy of the 1960's Heath Warrior.
Carl
KM1H
----- Original Message -----
From: "Tom Rauch" <w8ji@contesting.com>
To: <g3rzp@g3rzp.wanadoo.co.uk>; <amps@contesting.com>
Sent: Monday, September 24, 2007 8:17 PM
Subject: Re: [Amps] stability of amps
>> Does anyone have the s (or y or z) parameterts of the 572B
>> at frequencies up to 50 MHz and beyond? This would tell
>> you the potential stability.
>> My experience with 572Bs is that they are a real wotsit
>> at 10 metres anyway, and personally,. I'd avoid them like
>> the plague
>
> I would too, but that's because I like to use a tube on a
> frequency where it is very stable and predictable. That
> means well below the self-neutralizing frequency...not
> above.
>
> I once made sweep tubes operate on 6 meters as a bet from
> someone at Amp Supply, and then the things went into
> production!!!
>
> In many cases if we find a lucky recipe it can be repeated.
> That shouldn't be confused with engineering.
>
> 73 Tom
>
>
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