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Gotta watch those engineering samples. They are often shipped to manufacturers for mechanical purposes, not electrical, and may not be 100% functional. I've got GE 13" and 19" Engineering-sample CRTs for their PC-chassis sets. Big ugly purple label on them proclaiming "Engineering Sample - Not UL tested" and wouldn't you know it, a centered 2" plus sign, burned in the Phosphor. The tubes are NEC-made, and were obviously not for production. Good tubes electrically - just unuseable for any display purpose.
Reminds me of the RCA ceramic DIP IC engineering samples I got from a retired avionics engineer - lotsa gold, but no innards. Just a sample of the package, along with engineering drawings and the proposed EIA/JEDEC package drawing. I've got a 1967 Radio Electronics magazine with them in there - old RCA meatball on the ones in the magazine, but mine all have the newer, stylized RCA logo. You see them pop up on fleabay occasionally, usually embedded in acrylic.
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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