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On Wednesday, September 13, 2023 at 6:47:33 PM UTC-4, Wu Ming wrote:
>
jad...@vwtype3.org <
jad...@vwtype3.org> wrote:
> > On Tuesday, September 12, 2023 at 7:03:10 AM UTC-5, Wu Ming wrote:
> >
> >> On multiple accounts a simple turning of the selector forth and back
> >> repeatedly for few minutes should fix the issue. It did few years back but
> >> the trick doesn`t work anymore.
> >
> >> Anyone with direct experience of it? Thanks for sharing.
> >
> > If you look at the tuning capacitor in any older radio, you`ll see that
> > it consists of a bunch of interleaved plates, half of which are mounted
> > on a shaft that rotates to let them mesh more or less. The more they are
> > intermeshed, the higher the capacitance and the lower the tuned
> > frequency. Taking a more careful look, you`ll notice that the stationary
> > plates are insulated from the frame of the capacitor while the rotatable
> > plates are mounted directly on the shaft which is in contact with that
> > frame. The electrical connection between the shaft and the frame is thru
> > a ball bearing on one end and usually a brass spring on the other end.
> > Both ends were lubricated at the factory, but, with time, that
> > lubrication dries out and oxidation occurs. Metal oxides tend to be
> > insulators. Once the contact between the shaft and the frame, where the
> > radio makes its connection, becomes unreliable or intermittent, you`ll
> > stop getting reception or there will be a lot of noise as
the shaft is turned.
> >
> > Moving the shaft back and forth can break thru those insulating films.
> > You can try Deoxit to remove the oxides and follow up with Shield to
> > provide some longer term conductivity. I like to also add a bit of high
> > quality corrosion preventive grease at the same time, for the
longest term benefit.
> >
> Thank you for the details. Interesting. Will try.
If it`s one of those open frame tuners, have at it. If it`s one
of those clear plastic super compact square tuners with plastic film
separating the plates, then any cleaner you use that carries a lube that
doesn`t evaporate will detune the tuner. It will work, but it will cause
your dial to be off, sometimes quite a bit. Over time, the error will
slowly decrease but never go away. If the radio has an osc trimmer, you
might be able to fudge a lot of the error away.
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