[Drake] cleaning dial of TR 3 and TR 4

[Leland Bahr]

It has been my experience Drake dials do not normally yellow.  However, it
has been my experience that if a radio has been left in the sun for
sunlight to hit the exposed dial that is kept in one spot for a very long
extended period of time, the dial will turn brown at that spot.  I have
never seen a dial like this ever be brought back to a normal clear
appearance.
Lee Bahr
w0vt
>
> John King wrote:
> > 
> > One of my transceivers has a dirty or nicotine stained
> > plastic dial. Has anyone successfully cleaned a Drake
> > plastic dial without removing or destroying the
> > numbers and letters on the plastic dials.
> > 
> > Please tell me your methods and experiences cleaning
> > the dials. Thanks and 73, John, K5PGW
> > 
>
> I suppose it could be yellowed by nicotine, but my
> experience has been that these dials yellow with
> age regardless of environment.
>
> It is some sort of reaction of the plastic
> material due to exposure to heat (from the pilot
> light) and sunlight.  The yellow is generally not
> a surface film but goes through the plastic.
>
> If you try to clean it all you will accomplish is
> to remove the markings.
>