Bob Green wrote:
>
> Hi all --
>
> Does anyone have info about the type/size wire used in Heathkit p/n 45-61, a
> 50 uH RF Choke in the HV path of the SB-201? It may be the same part used in
> the SB-200. It looks like about 28-30 gauge enamel wire.
>
> Mine looks like it has been VERY hot, so hot that the enamel is burned off,
> but still works.
I suggest that you temporarily short-circuit the choke and (with the amplifier
off) look for resonances with a dipmeter, particularly near 17 meters. It's
possible that the choke has a series self-resonance near a frequency on which it
was operated and this caused the heating. If this is the case, you may be able
to move the self-resonance by removing a few turns.
73
Vic K2VCO
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