[Amps] toroid tank coil heating up

[Victor Rosenthal]

The blue type ( -1) would give you more inductance with fewer turns on 
160 and 80. I suspect it would run cooler. I don't know how, or if, it 
would work on 40.


You might try a stack of one of each (OK, that was a joke!)


Have you determined the operating Q? Maybe you can lower it to reduce 
the current.

73,
Victor, 4X6GP
Rehovot, Israel
CWops #5
Formerly K2VCO
https://www.qsl.net/k2vco/

On 26/09/2021 18:54, John Keating wrote:
> My 2 x 3-500Z amp uses a two-stack T-225A-2 red mix iron powder toroid for 160-80-40. It gets hot, especially on 160, changing the loading and causing the grid current to drift up on extended transmission. This is not a new phenomenon, but I thought I would ask the experts if there is a remedy, perhaps other than using a triple stack or going to an air core coil, neither of which I have room for.
>
> John
> AI6LY
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