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Re: [Amps] High temp magnet wire?

To: <>
Subject: Re: [Amps] High temp magnet wire?
From: "Peter Voelpel" <>
Date: Mon, 10 Dec 2018 17:11:57 +0100
List-post: <>
I tried that choke in my 3x 4-400 amplifier, it immediately went up in smoke
on 17m.

Peter, DJ7WW

-----Original Message-----
From: Amps [] On Behalf Of Jim Thomson
Sent: Montag, 10. Dezember 2018 10:24
Subject: [Amps] High temp magnet wire?

Date: Fri, 07 Dec 2018 19:21:02 +0000
From: Manfred Mornhinweg <>
Subject: Re: [Amps] High temp magnet wire?

> JI depicts some sky high  Z
> numbers, etc, when he tested that choke  with his VNA.... on all  9 x
>  bands.

<<<Would like to see that. Is it piblished somewhere?


###   Excellent writeup.
Scroll to the bottom to see his VNA results.   For choke dissipation 
he is using   RMS  voltage  squared  /    RP.    RMS  RF voltage =  60%  of
loaded  B+. 

##  Note, that  graph at the bottom is NOT the currently produced  choke
Ameritron uses... which   btw, is the same one sold by RF parts.    Its also
the same choke
used in the current crop of alpha amps.   The choke depicted in the graph
resonates on 
12.1  mhz  and 15.7 mhz.     The current production choke resonates on 12.5
mhz..and  27.1 mhz. 

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