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Mysterious vacuum tube

Discussion in 'General Electronics Discussion' started by Xeno Xenox, Sep 19, 2017.

  1. Xeno Xenox

    Xeno Xenox

    49
    15
    Mar 13, 2016
    A friend found this vacuum tube on the beach near San Francisco.

    Can anyone help me ID it? Anything would help -- function, age, manufacturer, etc.

    I haven't seen it in person yet, so I can't say whether it has any legible markings.

    upload_2017-9-19_14-38-30.png
     
  2. Bluejets

    Bluejets

    3,422
    690
    Oct 5, 2014
    4 pins....rectifier?
     
  3. Xeno Xenox

    Xeno Xenox

    49
    15
    Mar 13, 2016
  4. dorke

    dorke

    2,342
    664
    Jun 20, 2015
    It has 4 pins, 2 thicker (any side bayonet pin ?).
    Better quality pictures from all sides may help.

    The socket is called UX4( U4A).
     
  5. Externet

    Externet

    702
    142
    Aug 24, 2009
  6. JRUBIN

    JRUBIN

    95
    15
    Jul 17, 2015
    4 pin, directly heated cathode no doubt. Triode amplifier, pins look a bit worse for wear. I bet it still works if it hasn't been breached.
     
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