[Arran]

Unless one of your local TV shops is run by an old timer, who has been in the business since the early 70s, or even earlier, the chances are that none of them will touch a Philco Predicta, or any other tubed chassis TV set. It sounds to me like the set has a problem in the vertical section, or at least that's the most obvious problem, although there are going to be others.  These are TVs that really need more then just a repair, they need a full restoration, not just the usual capacitor and resistor replacement but replacement of the networks which look like a ceramic rectangle with multiple legs. Tube sockets are another weak point in these, as mentioned, depending on how many hours are on the set, the socket contacts have a habit of breaking after tubes are pulled out and replaced multiple times. One of our members has restored probably a 1/2 dozen of the 1958-59 model Predicta chassis, but I don't think he is taking on any more at the moment since he bought himself a house.
Regards
Arran