[Amps] 60 filament noise

[StephenTetorka@cs.com]

Hi Rich:

Please excuse me for not providing more detail.

I made a 1929 Hartley using a 204A Heising modulated with an 849.

Both tubes are filament heated with 11 VAC @ 5 amps wiht center tap on 204 for keying..or plate on during AM...ct on the 849 for 'modulation control'....

In one QSO, I was told there was a little hummmmm on the signal..otherwise good.

I'd like to have just 'good.'...hihi

R,
Steve
WA2TAK




"R. Measures" <r at somis.org> wrote:

>
>On Feb 6, 2006, at 7:36 AM, StephenTetorka at cs.com wrote:
>
>> Hi all:
>>
>> Might it be possible to apply a high-pass filter to eliminate the 60 
>> Hertz ac
>> power supply noise from getting into my filaments?
>>
>> Also..it is my understand that using a DC filament voltage works just 
>> as well
>> as the AC...correct?
>
>For heater-type cathodes or filament-type cathodes?
>>
>> Regards,
>> Steve
>> WA2TAK
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>>
>>
>
>Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>
>