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yes i heard that the cathodes need to be cooked to kind of activate after rebuilding. both 7jp4 and 7jp1 guns are identicle except the different phospor. switching guns between crts i dont think would work because of the cathode coating that somehow protects it from outside air. by the time the guns are swapped the cathode is history. its weird how that meterial is, so how was it put on in the first place when the cathode was new, do they rush coat it and then put the protector coat on that seals it from air ? just wish there was a way someone here can come up with his own way of reviving these tubes.
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