[DaveWM]

as previously stated, you need to make sure tube sockets are clean esp since it seems they maybe part of the intermittent video signal.

One issue at a time, get that worked out 1st then next will be the horz/vert lock issues.

My guess is you have an AGC or sync separator issue (or a signal issue from the RF source), there are many causes for this, but again FIRST get the intermittent issue worked out.

you should not have to worry about just touching a wire or a tube and have that cause a problem.

on and DONT squirt cleaning solution all over the sockets, esp the tuner. Rather pull the tube out spray the pins, then insert the tube several times. Most times that is all that is needed to clean the socket. Look at the pins of the tube if corroded use fine (500 grit) paper to clean off or use a brass bush.

on really bad sockets I use carb cleaning spiral brushes (soaked with cleaner/lube) to clean out. BUT you don't want to use too large a brush and risk opening up the little socket holes.