[R-390] 60 Hz Hum Output from R-390A IF Module

[Jon Schlegel]

Roger,

Something tells me it will take more than the addition of some 
parts...  When I get the IF module behaving again (bursting 
oscillation) I'll try DC filaments straight away.  Dave's remark 
about the bench supply reminded me of the semi-boatanchor Lambda I 
have squirreled away that will do the job nicely.

Regards,
Jon

"What's the most important circuit in a radio???  -  Ground"



At 06:13 PM 5/10/2009 -0400, Flowertime01 at wmconnect.com wrote:
>Jon,
>
>I see your concerns. Stay with it and see what you can do. If you can find
>a point to stick in a couple extra filter caps, or change a resistor to
>reduce the hum let us know. A few good changes can always be in 
>order. Most of
>us do not really get down into the subassemblies as we should. You could
>provide us some insight from your experience.
>
>Roger AI4NI