====== Tube Manufacturing Codes ======

Hi,

It was commonly known that tubes were made by one manufacturer and sold by another.

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. 

If Eimac really made the tube, the code # 162 should appear on the tube somewhere.

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.

Do you see one of the following numbers stamped on your 7289s ?

Just for your information (FYI).

73,

Jerry    W7QX  


  
      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