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The manufacturer number, or Electronics Industries Association (formerly RETMA) number, usually 3 digits, and usually precedes a date code. There are over 1100 EIA codes, but only one for the CRT - usually an RCA ( code 274 ), Sylvania ( code 312 ), Zenith ( code 343 ) or Clinton ( code 1240 ). Others such as Sony, Mitsubishi and Sharp made some tubes, but they are clearly marked.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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