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Mysterious vacuum tube

Xeno Xenox

Mar 13, 2016
50
Joined
Mar 13, 2016
Messages
50
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
 

dorke

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

The socket is called UX4( U4A).
 

JRUBIN

Jul 17, 2015
96
Joined
Jul 17, 2015
Messages
96
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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