So after finding a free TV on Craigslist, I was able to complete my first tube swap. For the most part things went pretty smoothly, but the chassis had to be moved further back because the new CRT was a little bit bigger than the tube that was originally in the Turtles game. Before putting it back in I check each capacitors with a cap analyzer and replaced two that were a bit weak. The game seems to play fine now, but I am having a couple of issues when doing the convergence. I was able to get a solid green screen using a monitor pattern generator, except in the top upper corners it was slightly blue no matter which way I adjusted the yoke. I degaussed the monitor with an external degausser both before and after I was done, but it did little to help.
I was wondering if this is normal, potentially an issue with the flyback or one of the other caps that I didn't replace, or if there's a way for me to verify that the new tube isnt' what's causing the problem?
I also have the horizontal adjustment potentiometer, all the way turned up and it barely centers the picture. For some reason I feel like I should be able to keep the horizontal pot at medium level so that I could make adjustments right of left to it, if need be. Finally, at the very top of the screen, it almost looks like the screen bends slightly.
None of these are anything that really distracts from the game, but on the test screens it's pretty obvious that it's not perfect and even in the game, there are certain screens where you can tell that the colors look washed out in the top corners. The bending screen on top, almost makes me think that I missed a bad capacitor, but before yanking the monitor back out or super gluing the yoke into a permanent spot, I wanted to see if anyone had some tips on improving the picture or if there's a way to check compatibility between the old chasis and the new monitor. Also, is there any advantage to keeping the yoke from the old TV? My understanding was that the Yoke is synced to the chasis and since I'm going to be using the old TV chasis to let one of the neighbor practice desoldering so he can learn to fix his arcade, I wasn't sure if it was useful or not. I do have other 25" monitors missing their yokes, but for some reason didn't think I could just pop it on and expect it to work.