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In Reply to: RE: I.D. for 45 tube w/brown base and guide pin? posted by Frihed89 on January 21, 2015 at 16:38:24:
The 45 has a UX4 base with wide heater pins, so it's a mystery to me....Although early on, manufacturers had their own tubes and sockets.
So the tube could be pre-1920s.
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Edits: 01/21/15
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- RE: I.D. for 45 tube w/brown base and guide pin? - Garg0yle 16:54:38 01/21/15 (0)