JF Antique Radio Repair -- Tube Equipment Repair (Radios, Amplifiers, and Car Radios)
www.jfradiorepair.com

Silvertone Car Radio

TUBE CAR RADIO REPAIR

I have been repairing Tube Type Car Radios for the past 30 years. I repair all makes and models.


REPAIR VS RESTORATION

       I repair equipment and do not perform restoration.
       Restoration involves placing new parts within the shells of the old parts, or placing new parts inside of moulds of old parts that are painted to look like the old parts.
       Repair involves installing new parts under the chassis. All exposed parts on top of the chassis stay in place (are not removed).

SOLID STATE VIBRATORS, Please click on this Tab: Antique Automobile Radio - AAR)

        Unlike mechanical vibrators, Solid State vibrators are polarity sensitive. All Solid State vibrators have a
        suffix after the part number that designates the vibrator for use in a Positive or Negative ground
        electrical system. The Antique Automobile Radio (AAR) Automobile Battery Grounding Chart shows the
        proper ground polarity for all major US automakers from 1932-1957. If you are not sure of your vehicle
        ground polarity, please check which terminal of your battery is connected directly to the engine block or
        car body.

        A Solid State vibrator will not fix an otherwise "broke" radio. Nothing can compensate for shorted buffer
        condensers, deteriorated electrolytic capacitors, or other ailments common to 40 or 50 year old radios.
        If you want to try a Solid State vibrator because mechanical vibrators keep burning up in your radio, it
        would be a good idea to first have the radio checked out for shorts in the B+ circuits. Rule of Thumb: 6-volt
        radios should draw approx. 1 amp per tube, not counting the rectifier. 12-volt radios that use a
        vibrator should draw about .5 amp per tube excluding the rectifier.

        Whether you use a Solid State or mechanical vibrator, both the radio manufacturer and the vibrator
        manufacturer recommend that you replace the buffer condenser each time you replace the vibrator.
        Note: In some synchronous vibrators, the buffer is built into the vibrator.

        Solid State vibrators cannot be tested with an ohmmeter or with a conventional vibrator tester. All of
        their parameters are tested during and after manufacture, and must meet exacting standards. Field
        testing should be done by installing the vibrator in a radio known to be in good working order, and of
        the proper polarity.

        Do not operate your radio directly from a battery charger.
        Never install a 6-volt radio in a car with an 8-volt battery without a reducer.
        While the above practices probably will not damage the vibrator, either can destroy other parts of the
        radio in a very short time.

        Due to the possibility of vibrator damage due to reverse polarity mentioned above, I cannot guarantee
        Solid State Vibrators.

DEFECTIVE COMPONENTS

       Defective components shall be replaced.

CAPACITORS

       All filter and paper capacitors shall be replaced.

TUBES

       All tubes will be tested for Emissions and Leakage (shorts). Bad tubes shall be replaced.

CIRCUIT MODIFICATIONS

       I will not replace tube circuits with a solid state circuit board.

LIMITS OF REPAIR FOR RADIOS MANUFACTURED AFTER 1950 (due to potential Silver Mica Disease)

       For limits of repair for radios manufactured after 1950 due to potential Silver Mica Disease, please click on this Tab: Silver Mica Disease

TEACHING REPAIR

       If you would like to learn how to repair Tube Equipment, please contact me. I do not charge for my time, only for parts used.

REPAIR SERVICE TAB

       For more information on Repair Service and Cost, please click on this Tab: Repair Service/Cost


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