Update to the Henry Hum. Much of the hum was magnetic pickup and
moving things and better grounding solved that. It was another
operator that first said "That's 120 cycle hum". I don't think it was.
It was 60 cycle hum.
The Henry 2K-4 and other Henry amps use a filament choke wound on a
torroid. More than one Henry owner told me they solved their hum
problems with a rod based bifilar wound choke. RF Parts has them for
20 bucks. I replaced the stock choke with it and that solved the hum.
Maybe this will help others in the future.
73, John KX5JT
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