Quote:
Originally Posted by miniman82
Guys, I have a supposedly NIB 3NP4 projection tube I got from that estate in Richmond but I don't know how to test it. I have a CR-70, is there a way to get a meaningful result from that, or am I stuck trying it in an actual Norelco system?
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I tried testing a couple of 3NP4's on a CR-70, setting it up as a scope tube and connecting G2 to pin 3, I was able to get a cutoff setting and an emission reading, but on the low side. I don't know what condition the tubes are in as they were just in a box of loose CRT's. They won't test at all as a 5TP4 or any other "normal" picture tube.
I'd say the best test is in a operating projector.
Chuck