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<19177721-1b09-4731-a6e7-d02371708c04n@googlegroups.com> f06cf31c
@REPLYADDR Wu Ming <wu.ming2@icloud.com>
@REPLYTO 2:5075/128 Wu Ming
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jad...@vwtype3.org <
jadney@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.
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