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Tube identification: manufacturer logo/markings database?

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  • Tube identification: manufacturer logo/markings database?

    Anyone know of a comprehensive database of tube manufacturer logos/markings, or other identifiers? My interweb search skills stink; I'm not finding anything but it seems like there has to be something out there.

  • #2
    One would have to be a full time anorak to even contemplate such a neverending gargantuan task, full of pitfalls, endless cross references and slight innacuracies.
    I am at this moment willing the person who has undertaken this task to make themselves known. I for one, salute your endevour!

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    • #3
      Uh, ok.

      Forget I said comprehensive then. Anyone know of a database of tube manufacturer logos/markings, or other identifiers?

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      • #4
        If it is an old tube here is a list of Manufacturer.

        Tubes and CRT's EIA code
        Amperex (USA) 111
        Bendix 125
        DuMont 158
        Eimac (Eitel-McCullough, Inc) 162
        Electronic Tube Corp 169
        General Electric Co (USA) 188
        Hytron (CBS-Hytron) 210
        Machlett 231
        RCA (Radio Corp of America) 274
        Raytheon 280
        Superior Tube Co 310
        Sylvania (Hygrade Sylvania Corp) 312
        Tung-Sol 322
        United Electronics 323
        Western Electric 336
        Westinghouse 337
        Zenith Radio Corp (CRT's) 343
        Nortn American Philips Corp 423
        Taylor (aka Cetron-Taylor) 713
        Lewis & Kaufman 738
        National Electronics (also Cetron) 749
        Penta Laboratories 771
        Vacuum Tube Products 781
        Varian Associates 809
        Litton Industries 879
        Electrons, Inc 935


        I had a more comprehensive list but can't find it at the moment. Euro tubes have their own system. many have an etching in the glass that is pretty definitive, with dates and factory. like Mullard, Telefunkens have a Diamond on the bottom of the tube glass between the pins.

        All this info is on the WEB.

        the actual labeling on the tube may or may not reveal the the truth about who and where it was made.

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        • #5
          Valve types

          I just Google this and enter the tube number I wish to cross ref. or examine.

          http://www.google.com/search?hl=en&q=radiomuseum+12bh7

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