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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.
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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! -
Uh, ok.
Forget I said comprehensive then. Anyone know of a database of tube manufacturer logos/markings, or other identifiers?Comment
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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.Comment
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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+12bh7Comment
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