HI!
Take a look at some of the videos on youtube, especially this guy's stuff, he is
one of the best as far as learning old tv stuff.
http://www.youtube.com/watch?v=o8eK2CyDmiY
Look up convergence adjustments on youtube for more.... This will get you a really
good start, and it don't matter much if this one is a zenith.... Just learning procedure....
.