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The original cords should be fine for vintage TVs, and honestly most of the late 40s and 50s sets (other than projection sets), use under 300 watts. And with the vacuum tube circuitry, they "soft-start", and have very low surge current. There's no load on the B+ line until the rectifier warms up slowly, and by then, the filaments are all up to run current load, and last, the CRT doesn't draw much of anything until the high voltage comes up.
In a solid state color set however, there's a radical inrush load when the degaussing coil fires, and the whole power supply and high voltage pop on at the same millisecond. That's why the fatter cords on newer sets.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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