"crt change 101 "
obviously, stay with the same size/type crt.
"junk" tv's on trash day can be a source of reasonably priced replacements

once a suitable donor has been located , be sure to mark the position of the convergence/purity rings
they will be needed later- DO NOT DISTURB RINGS . not a bad idea to also mark the yoke position . it may vary when the game yoke is installed. but, good for reference .
after discharging the crt , one can proceed with crt removal. be careful and take your time !
disconnect anode and yoke connections on dud crt / remove "neck board"
u may need to swap deguassing coils . usually , the game original can be easily kept .
set monitor face down on a towel to remove crt retaining bolts .
same proceedure for donor crt - if from a tv , it will need to be lifted out of the set ( easier with a partner on 25" + )
once donor crt is in place in game frame , install yoke as close to the orig mark as feasable .
the donor's conv/purity rings need to be in the EXACT original position .
once everything is reconnected and triple checked , time for a test fire .
if all went well, only minor yoke position adjustments will be needed.
check purity , convergence . if good , then adjust focus, white balance/color drive, etc...
a good mirror is handy !
qrz