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ham_radio:tube_manufacturing_codes [2013/01/08 19:00] (current)
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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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