[aurizon]

That 'snap' is the arc and the voltage = zero until it gets going again - repeat. This is common on old monitors as dust builds up and often a fix can be done by a careful cleaning plus application of 'corona dope' along spark paths. Turn it on in a dark room and watch/listen for the spark. Dope that path and alternate paths and dry with hair dryer. Test. There are universal repair flybacks - select what seems to fit. Usually the existing controller will serve - computer monitors are far smaller than most TV's of that era. Hardest thing is finding new old stock. To save the nation new flybacks can be wound - complex but doable. Hardest problem is adapting the space and circuit. The flyback can be wired point to point with hookup wire. Only the HV wire needs to be HV wire. Then you can zip tie the flyback in whatever space and dress the HV with respect.