[wa2ise]

I'd just replace the fusable resistor with a fuse in series with a new resistor. According to the markings, I'd guess that it had a resistance of 7.5 ohms. Not at all critical. Anything from 5 to 10 ohms will work. As for the fuse's current rating, well, the horizontal is the current hog, and the rest of the set likely comsumes as much for everything else. Take a look at the nameplate watts rating. Add up the wattage of the tube heaters and subtract that from the nameplate. I see what looks like a power transformer, so you'll need to measure the high voltage secondary, likely 120 to 250VAC. Once you have that, divide the watts by it and that will yield a nominal current approximation. Size the fuse about twice that.

Once you install this, use a "dim bulb" tester. That's a large light bulb, 200W or so wired in series with the TV set power plug. After the tubes are warmed up, the bulb should only glow dimly. If it stays bright, you likely have a short on the B+. The bulb is to limit powerline current to hopefully avoid frying the transformer.