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I am a bit confused is there a reason to think one gun is weaker than the others? there can be a lot of reasons for weak color that does not include a bad CRT. I just got worked on an RCA that had almost no blue and red, The crt tested very good on all guns. It was a broken wire on a pcb that supplied B+ to a color amplifier tube. Video amp tubes can mess up the bias of a CRT, and AGC can cause a lot of problems if not workiing properly. Even really bad CRT's can be setup for decent performance, not great but decent.
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