I use 20g for my YC-156 choke works fantastic..Jim..K7RDX....
On Mon, Dec 3, 2018 at 8:36 AM Jim Thomson <jim.thom@telus.net> wrote:
> 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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