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Another factor to consider is whether your line voltage might be higher than in the era when a particular set was new. Wattage (and heat) don't go up linearly with voltage, since volts X amps = watts. F'rinstance, if a set drew 1 amp at 110V, wattage is 110 watts. But if voltage is 125V, amp draw will be 1.25. Ergo, 125X1.25 = 156.25 watts.
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