[Milsurplus] BC-221 with noisy tuning

[J. Forster]

Put a receicer w/ a BFO nearby and listen. Then gently tap things,
possibly starting w/ the oscillator tube. When you finde thye thing that
warbles you're done.

-John

==============




> I have a BC-221 with integral power supply. When I monitor the frequency
> on
> an external
> set, tuning slowly has a distinct 'warble' to it. This feels like some
> sort
> of mechanical problem
> (although I imagine it could also be due to something like metal whiskers
> on the tuning
> capacitor blades).
>
> Once I stop turning the tuning control the output frequency is rock solid.
> I can move it up/down
> smoothly with the 'Corrector' control.
>
> The tuning control doesn't have any grittiness to it when turned, but of
> course there could be
> backlash in the drive mechanism.
>
> Suggestions welcomed.
>
> 73, ian K3IMW
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