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Originally Posted by WISCOJIM
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http://www.mif.pg.gda.pl/homepages/f...3/1/12LP4A.pdf
That tube is ~5" longer than a 12LP4, and uses an 11-pin base instead of the standard 12-pin...Those are obvious enough differences that one would probably notice.
How many pins can the base accommodate, and how many pins are actually populated? (the 12LP4 is a 12-pin but only ~5 are typically populated)
Does the gun look to have electrostatic deflection plates (or leads for them going to the front) in it, or a bend in the lower part of the electron gun for an ion trap? Got pics?
One exceptionally unlikely scenario that would be even harder to mix up is if you scroll down this page:
http://www.myvintagetv.com/picture_tubes.htm to the 10HP4 which was a 10" version of the 7JP4 which Raytheon used in some TVs...Maybe the 12HP4 is a 12" 10HP4...If it is that is one rare tube, and one some electrostatic set collectors (myself included) tired of squinting at 7JP4s might want to have.