A crude test could be to feed both filaments with DC?, at least
temporarily
for testing purposes. A cheap power supply (although it is required to rewire
the filaments in parallel), would be a personal computer one, Its 5V output in
most cases are rated to 30A.
Best regards
Guillermo - LU8EYW.
R L Measures escribió:
> On Aug 6, 2006, at 2:09 PM, Tom W8JI wrote:
>
>
>>>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.
>
>
> Agreed. The 2KD-5 has seriesed filaments.
>
>>73 Tom
>>
>>
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>>
>
>
> R L MEASURES, AG6K. 805-386-3734
> r@somis.org
>
>
>
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