[Amps] 60 filament noise

[R.Measures]

On Feb 6, 2006, at 10:18 AM, StephenTetorka at cs.com wrote:

> 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.

DC is okay for heater-type tubes, but for filament types, it is 
problematic.
>
> 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
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
>>>
>>
>> Richard L. Measures, AG6K, 805.386.3734.  www.somis.org
>>
>>
>
>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org