1975 CCII stopped working

[Laserdisc]

I picked up this 1975 zenith chromacolor II today for cheap, worked ok not great at the sellers place. The tube seemed kinda dim and it progressively got brighter to a point over the course of about 5-10 minutes and stopped with a slight pinkish hue. Got it home, blew out the dust and cleaned the customer controls and now it's got audio, high voltage, nice and stable,but a blank tube. It's like if the brightness was all the way down because with that at max you can catch bits of super dim picture occasionally and it has faint interference as you change channel. Also has the usual CRT power down flash/picture shrink/I'm not sure what to call it but the thing they all do. Please help because I was finally really close to having a working chromacolor II.