When I have seen polarity switches on old radios, they have been labelled as
such. But what he was describing sounds like the trimmer. The polarity
switch is usually a two position slider, like a DIP.
on 8/29/07 2:54 PM, Rick Lindsay at rolindsay@yahoo.com wrote:
> Old AM radios also have antenna trimmers on the
> chassis. They are used to tune the radio to the
> antenna. If you find that is what you have, just
> power up the radio, tune a weak station and gently
> turn the trimmer back and forth for the loudest
> signal. Of course, if it is a polarity switch DON'T
> TOUCH IT. :-P
>
> rick / amateur radio geek
>
> --- Wilkmanracing@aol.com wrote:
>
>> I am privileged to own a 1960 MGA that has been in
>> my family since new.
>> While I still have the radio installed by the dealer
>> (Johnny Lail, Glendale,
>> CA), it has not been in the car for a number of
>> years. Now I'd like to have it
>> restored so I can return it to its rightful place in
>> the dashboard. It's a
>> Philco, five pushbutton AM radio. All the knobs
>> and buttons are there. The
>> chrome face would need to be replated and the
>> plastic knobs/buttons would need
>> to be cleaned. I don't know if the radio works,
>> but I assume it needs an
>> overall tune-up. There is a screwhead switch on
>> the side of the radio that I
>> presume is used to switch it from positive to
>> negative ground. My car is
>> positive ground, as supplied from factory. Can
>> anybody recommend a vintage radio
>> restoration specialist for my radio? I live in
>> Riverside, CA, but don't
>> mind shipping it anywhere in the USA.
>>
>> Bill Wilkman
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
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