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Where would the differences take place , on one of the grids of the 7jp4 ? If there is a 500 volt difference between the 2 then I was thinking of putting together a power suppy to apply this voltage to where ever this voltage is needed to be able to test. Even if I was able to test a good one and then a bad one I could use that comparison and get an idea of what a true one is as well as maybe remove shorts if any. Shorts in the gun could have an affect on its operation so being able to test and or remove a short may help. Does anyone know what PIN numbers on the 7jp4 are used to test the tube? I know 1 and 14 are the heater. There are 6 shielded wires that carry hv for the vert, horiz other then those there are 2 for the heater and 2 others, yellow and brown heater and red and orange are left. There must be a way to modify a tester to do this even if it does not lift the meter into the good zone, but rather have a baseline between a known good tube and a known bad tube.
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