Date: Sun, 2 Dec 2018 11:20:35 -0500
From: "Tim Duffy" <k3lr@k3lr.com>
To: <amps@contesting.com>
Subject: [Amps] High temp magnet wire?
<Looking for #20 high temperature magnet wire - sometimes referred to as
<Thermaleze.
<Any ideas?
<Need high temp rating for a plate choke rebuild.
<Tim K3LR
## I tested 22 gauge plane jane magnet wire, with my current limited
lab supply, and ran 5 Amps CCS through it for 1 hr, stone cold.
22 gauge was used on a buddys 3x6 amp, all bands.
## 20 gauge will handle even more. The RF current through the plate choke
is miniscule at best. On the lower bands, like 160-80-40-30m, the plate choke
ends up being parallel resonated with the tune cap, so the chokes Z
skyrockets.
Thats the extra tune C required, when using less than optimum choke uh. The
chokes
XL needs to be cancelled out with an equal amount of XC...from the tune cap.
## 27 gauge runs at ambient room temp, with 1.5 A CCS flowing. With
1.6A, it gets warm, 1.7 its hot. 1.8 its stupid hot, goes into thermal
runaway..fast.
## I tested 24 gauge, but cant find my results from testing. Suffice to say,
24 gauge will
handle a lot more than 27 gauge.
Jim VE7RF
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