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Originally Posted by Charlie
Guys,
One of the items I brought home during our adventure the other day is a tiny little crt. It's a 902A. As you can see, it's pretty small. Only about 7 inches long, and the screen is roughly 1 3/4 inches in diameter. Did these have a specific use? Or can this be used as a test crt? I couldn't find any info on this number in my tube book, so, I don't know what voltage the heaters run on. Suggestions?
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This was a CRT that RCA brought out in the late 30's for use with CRO's & TV experaments, I remember seeing an ad for them in an old QST printed in late 1938, These crts came with either green P1 or white P4 phosphours & they were electrostatic deflection as well.