USA tube manufacturer 'NU'?
USA tube manufacturer 'NU'?
Hello,
can someone help me identify the US tube manufacturer "NU" - see attached pictures.
Greetings G.Linss
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![Emilio Ciardiello](https://www.radiomuseum.org/image.cfm?image=person.jpg&width=120&height=140)
Hello,
it should be the already coded National Union Radio Corporation, Orange NJ, USA.
Regards, Emilio
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Grazie Emilio,
that's what I thought too but a firm confirmation would be nice to have.
Greetings Götz
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National Union
![Thomas Albrecht](https://www.radiomuseum.org/image.cfm?image=usa_albrecht_thomas_2012.jpg&width=120&height=140)
Dear Götz,
Although I don't have a tube with exactly the same logo as you see on your 813, perhaps the following pictures will be fairly convincing as to the common usage of the letters "N U" by National Union in marking tubes and their boxes.
The tube in this picture unfortunately has a major smudge in the logo, but you can still clearly see the prominent "N U" that was printed on this National Union tube.
Best regards,
Tom
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Hi Tom,
thanks for your confirmation about NU. Are you active on the ham bands?
73 Götz, DJ3IW
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![Thomas Albrecht](https://www.radiomuseum.org/image.cfm?image=usa_albrecht_thomas_2012.jpg&width=120&height=140)
Hi Götz,
Not too active these days, but I do fire up my Hallicrafters HT-32A (vintage 1950s SSB xmtr) on the HF bands from time to time.
73,
Tom K6VL
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