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| + | ====== Tube Manufacturing Codes ====== | ||
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| + | Hi, | ||
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| + | It was commonly known that tubes were made by one manufacturer and sold by another. | ||
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| + | In order to identify which company ACTUALLY made the tube, the ACTUAL manufacturer's EIA code number would be stamped somewhere on the tube. Manufacturers would commonly make tubes for other companies. | ||
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| + | If Eimac really made the tube, the code # 162 should appear on the tube somewhere. | ||
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| + | As I recall, Machlett and GE appeared to make most of the 2C39/7289 family, so I would not be surprised to see Eimac tubes that were really made by Machlett or GE. | ||
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| + | Do you see one of the following numbers stamped on your 7289s ? | ||
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| + | Just for your information (FYI). | ||
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| + | 73, | ||
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| + | Jerry W7QX | ||
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| + | 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 | ||
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