[R-390] R-390A Restoration Progress (at last)

[Barry]

>I rewire the AC input to eliminate the RF Filter. Radio turns on
> and makes noise. AF Gain control scratchiness eliminated by just
> running pot back and forth several times.
>
> I can hear WWV on 10 Mc (yeah !!) with a short wire, but as I
> cycle through the B/W positions I notice the 4 Kc position has
> a marked reduction in level (audio out). I removed the module
> and gave the switch a shot of De-Oxit and I'll try it again tomorrow.
>
> Hopefully the Mechanical Filter is OK, but what are the odds that
> one or both Silver Micas are bad ? Would you recommend I just replace
> both of them ? I suppose if I replace them both and still have the
> lower level then the Filter must be kaput. I don't see any need for
> 4 Kc anyway !! Too narrow for AM.
>
> Comments ...
>
> 73, Dick, W1KSZ

Does your IF deck have the top and bottom trimmers for tweaking the 
inputs/outputs of the filters?  If so, these could need adjusting.

Barry - N4BUQ