[Amps] Henry 2KD-5 120 Hz Hum

[Fern Rivard]

Hi Tom:

    It could also be the smaller cap that's in parrallel to the filter 
choke in the power supply.    Fern


----- Original Message ----- 
From: "Tom W8JI" <w8ji at w8ji.com>
To: "hamguy2" <hamguy2 at fuse.net>; <amps at contesting.com>
Sent: Sunday, August 06, 2006 3:09 PM
Subject: Re: [Amps] Henry 2KD-5 120 Hz Hum


>
>> 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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