I would say the degaussing circuit is up the kyber...
Replace the positor, the little three legged box prior to the mains bridge, the coil that goes round the tube is attached to it if you follow the circuit. Make sure the set is unplugged from the mains before doing anything, and be very careful of charged capacitors. It might be prudent to stick a 100K resistor, with insulated leads, across the main ones in the power supply for a few secs each before you do anything else, just to be sure they are discharged. A nasty crack from the main smoothing block can easily kill a smps or worse, not to mention give you a new hairdoo.