I can't imagine the CRT getting damaged. What kills them is either a 'burn in' or if you REALLY push the voltages out of wack.
When you say 'dim and blurry', does it look like the TV's focus went out? If so, the 2AV2 (it's got one, right?) might be loose.
Pleae be careful in there, though. Voltage on the CRT is 25,000 or so, and the horizontal and vertical sections pack a good wack, too. Once the set's off and unplugged, it's not too bad, but the CRT can store up a bit of a charge that can startle you. Use common sense, especially around the sweep circuits and the HV suction cup on the CRT, and the HV section.
It sounds like you've got a few intermittent solder connections. Welcome to the wonderful land of RCA
