Explain the NeXTStation "dim monitor" problem, etc...

Hi, I know phosphors becomes fried slowly from long use but I'm referring to cathode emissions: I wondered whom is right? cathode oxide or heater coating? I think this is heater coating. I see this frequently on zeniths and zenith tubes clones for TVs since it used same socket and pinout. I used the rejuvenator so many times with those tubes to brighten them up and blow shorts out. Glowing bright orange and Crackling (lightening in a bottle)!! Sometimes you have to really hammer the guns w/ plastic tool to dislodge hard enough that tube sings to get shorts blown off. Ting! TING, TINGGG!! Shorts does kill transistors if they're not robust enough which is much about that because I fix TVs and monitors. And when a tech finds a dud transistor and swaps it, that tv comes back with same part blown because tube arc'ed again. Can be a day, days or weeks. Always small transistors (typically TO-92), rarely extends to expensive jungle IC. Now you know why I always blow shorts out on those tubes. This was from infos according to other techs on sci.electronics.repair. Cheers, Wizard