Guys!
Eight inch Marquee tubes do not often fail this way. Mr. o2, or an experienced technician, should disconnect the anode lead (the pink high voltage wire) of the green CRT from the anode splitter block (the gray block device which is screwed to the green tube cover) then isolate the splitter block from any metal of the chassis with layers of plastic bubble wrap, stand back and away, and see if the projector fires up with red and blue. This is 35,000 volts there, and it deserves your total respect. Run it for only long enough to see if high voltage fires up. The noticeable crackle of high voltage firing up at power-on would be very welcome, and might suggest that the cracked tube happened in shipping. If high voltage does not come up, then, very likely, the green neck board may have failed for the previous owner, and allowed runaway green beam current to crack the green tube face; this is ugly and suggests you need to replace the green CRT, the neckboard for green, and the high voltage power supply; $4000 USD or so in all. Remember that CRT neck boards, or final amplifier stages, apply a higher voltage (+85v to +130v) to the tube gun cathode to shut it off; lack of voltage means that the entire high voltage supply current meant for all three tubes funnels to the face of one CRT, and the heat can crack it in moments. E.mail me if I can offer further advice on what things to inspect or replace.
