[drh4683]

Disconnect the wire from pin 3 to ground of the horizontal output and put your mA meter in series (im assuming its a 6JE6 hot.) Most color sets of that era used this tube. If the cathode current is high (over 210mA, id start to be concerned) check the grid bias on the horiz. output in either case. Should be somewhere around -50 to -60 vdc. Again, if its the 6JE6, you can check this grid voltage at either pin 2 or 6, as they are internally connected to the grid of the tube itself. If the voltage is too low like -20 volts then check the oscillator, thats the problem, its letting the tube over conduct and resulting in the overheated fly. However, I think its common for magnavox flybacks to burn up like the rcas. Moyer has a few still.

Regarding the efficiancy coil, I think the magnavox sets used the coil mounted on the pc board like RCA. If its a high hour set then 9 times out of 10 the slug in the coil is frozen from heat and excessive force with the diddle stick will snap the coil tube in half! the coil tube is probably very brittle. Be very careful! If the cathode current is OK, (around 180mA) then its best not to even touch the coil. Ive learned the hard way..........