I repaired a 25" k7000 chassis board recently. In another 25" machine, I decided to try the chassis since its chassis was also a k7000, or one that looked almost identical. It worked for a little while, but I definitely had arcing inside the tube so I think the tube was a mismatch for this particular chassis.
My question is... what typically blows out if you get too much arcing like this in a tube mismatch situation? I definitely blew something out but I'm not sure what it was. I've replaced the flyback, C36, D18, HOT, and IC4 since but it's still not coming back to the state I had it. The HOT, IC4, and D18 definitely didn't read right. I did a cap kit right before it blew so it's also possible I need to re-cap kit.