• 3NP4 CRTs, what's the deal?

    From John-Del@21:1/5 to All on Sat Aug 3 08:44:52 2019
    Going through a bunch of stuff and ran across a box of 3NP4 CRTs. I know they were used in early PTVs, but not much else. Were they used for other things like test instruments?

    Wolcott, CT

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