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My CRT book sez its a 902, introduced in 1938,was 1st used in the RCA Model 151-2 oscilloscope. National Union also made 'em for the Navy during WW2. Doesn't have any info on voltages, except it would work down to 400 volts. You may have an oldie but a goodie...-Sandy G.
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Benevolent Despot
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