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Vintage Radiomobile 501T question

Discussion in 'General Electronics Discussion' started by Hematite243, Feb 12, 2019.

  1. Hematite243


    Feb 12, 2019
    Greetings. I'm interested in replacing the light bulb in a vintage Radiomobile 501T car radio. There doesn't appear to be a marking on this small bulb. Does anyone know the number for a replacement bulb?
  2. 73's de Edd

    73's de Edd

    Aug 21, 2015
    Sir Hematite243 . . . . .

    Need a photo of the bulb envelope and basing and physical measurements thereof.
    For that '61-2 ish vintage unit it would be a 12-14 VDC lamp and not over wattage / current, in case of any nearby plastic dial plate that might be discolored / melted.
    I'm thinking of a 150-300 ma range . . . . . my schematic only gave it a it a schematic designator of PL1 . . .NO furter info was provided . . . as would be on a full parts listing.

    73's de Edd . . . . .

    My family was s o o o poor, that if I hadn't been born a boy, I wouldn't have had anything to play with.
    Hematite243 likes this.
  3. Hematite243


    Feb 12, 2019
    Thanks for your reply. This is a pic. Fairly small bulb. Wish there was a marking.

    Attached Files:

    Last edited by a moderator: Feb 13, 2019
  4. davenn

    davenn Moderator

    Sep 5, 2009

    well it should be pretty straight forward ... measure the voltage across the socket that the bulb screws into and choose your wattage
    it's probably around 0.1 to 0.5 W

    That screw thread is very common
    Hematite243 likes this.
  5. duke37


    Jan 9, 2011
    Yes, MES minature Edison screw. Get a bulb with a voltage rating above the supply voltage.
    0.3A is common but you may prefer 0.1A to limit heat to nearby parts.
    Hematite243 likes this.
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