[R-390] Limiter hum

[Jon Schlegel]

Gordon,

Here's a thought that came to mind.  Even if H-K leakage were 
excellently low, I could see that some sort of imbalance in the 
heater wire geometry could capacitively couple an AC component onto 
the cathode.

Regards,
Jon

At 04:35 PM 4/29/2009 -0400, you wrote:
> >
> >
> >When I've had hum from the IF module, it in fact was caused by
> >heater-to-cathode leakage in the V507 limiter tube.
> >
>I've had that problem too.  The fault doesn't show up on a tube tester!
>Cheers, Gord, VE3EOS
>
>--
>
>Gordon L. Hayward, Ph.D., P.Eng.,
>Associate Professor, Biological Engineering,
>School of Engineering, University of Guelph,
>Guelph, Ontario, N1G 2W1.
>
>
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