-----Original Message-----
From: Jim <jdc@ieway.com>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: 28 November 1999 07:57
Subject: [AMPS] 4CX1600B Amplifier in new handbook
>
>Its been kinda "dry" here lately................ Lets have
a new
>discussion...................
>
>
>
>I am looking at the new 2000 ARRL Handbook. There is an
amplifier
>construction project in chapter 13. The amp is built around
a
>Svetlana 4CX1600B tube. I have been doing some research on
the article and
>have found MULTIPLE errors.
>
>What I have noticed so far is that the part numbers on the
toroids for some
>of the tank coils are incorrect.
>(L2.... 5 turns on 2 T-225-8 cores. Amidon does not make a
T-225-8 core.
>L3.....6 groups of 3 each etc on three T-225-28 cores.
Again, same problem.)
The catalogue of a UK outlet for Micrometals lists a T225-8
and T225-26 (double the Al of the -8) but no -28 material.
As an aside, there's a comment that the cores undergo
permanent shifts in characteristics if exposed to high
temperatures. Mu goes down and loss goes up. Could be an
invitation to thermal runaway.
Steve
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