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One more thing, that may have been mentioned already:: if this tube has not ben on in a while, it will need to "wake up", as do most all CRT's (bw or color) after sitting for many years, without being powered. When the power is first applied to the tube, wiht a PROPERLY operatng chassis, or tester, the tube will most likely show poor, or ever very poor, emission, BUT, after running for awhile, if the guns are ok, the emission will improve, to a usable level,and STAY there, IF the crt is not really bad(which does happen sometimes, but not that often, on the old sets) Normal 6 volts is NOT always enough, to wake up a crt, 8 or so, might be needed, until the cathodes "wake up".
NOW-- Maybe someone else can explain to me, why Crt's "fall asleep" ,and exactly what elerctro-chemical change occurs, in the cathode, to cause this.
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