USA tube manufacturer 'NU'?

Hello,

can someone help me identify the US tube manufacturer "NU" - see attached pictures.

Greetings G.Linss

• NU_1 (14 KB)
• NU_2 (12 KB)
• NU_3 (12 KB)

To thank the Author because you find the post helpful or well done.

Hello,

it should be the already coded National Union Radio Corporation, Orange NJ, USA.

Regards, Emilio

To thank the Author because you find the post helpful or well done.

Grazie Emilio,

that's what I thought too but a firm confirmation would be nice to have.

Greetings Götz

To thank the Author because you find the post helpful or well done.

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

To thank the Author because you find the post helpful or well done.

Hi Tom,

thanks for your confirmation about NU. Are you active on the ham bands?

73 Götz, DJ3IW

To thank the Author because you find the post helpful or well done.

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

To thank the Author because you find the post helpful or well done.