• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Name that tube manufacturer

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Hello everyone from sw michigan.Pulled this from an estey organ,had 7 of them.every time I scoop up something with tubes,I learn more,not sure if it is the tubes I'm addicted to or the knowledge I gain from them..it's like crack....lol
 

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You could well be right. I just see the oval inside rectangle label which is a Raytheon graphic and Raytheon used the word Nucleonic on the cover of one of their catalogues. 12AU7 is an American designation so the made in Spain thing could just as easily be a work around for paperwork reasons (It was done on other tubes).
Of course it could just as easily be made by someone else but I'd still bet a nickel that Raytheon figures in there somewhere.
 
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