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You can use an old line cord to plug into the variac. I put alligator clips on the wire ends. If you remove the B+ from the vertical transformer (usually the red wire coming from the power supply) and connect the variac from the transformer wire going to the tube socket (plate of the tube) with the set powered up, go from zero volts on the variac up slowly. You should get deflection as you increase the voltage from the variac. If the keystone still exists, the yoke is probably bad. This set has a "hot" chassis, be very careful with the variac connections. Do not let them contact the chassis. It looks like it has a power transformer but the transformer is filament only. The B+ comes from a voltage doubler.
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