Re: [Amps] Henry 2KD-5 120 Hz Hum

["Tom W8JI" <w8ji@w8ji.com>]

> It could be 60 Hz.  It sounds like 120 though.   A local 
> ham with
> band scope said 60 Hz and not a perfect sine wave.  He 
> said it was
> riding on the signal about 20 dB down.  This is an amp I 
> acquired
> recently and the hum problem has existed since I started 
> using it.

Sounds like a filament balance problem to me.

73 Tom 


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