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Another cheap way is the "dim bulb" tester, put an incandescent 100 watt or so light bulb in series with the set, or start smaller then go up. I've even used grid from an old toaster as a series load, to apply a bit more voltage, but still less than 120v. You can slo monitor the current the set draws as it warms up, the wattage rating on the radio will let you calculate what the 'normal' current draw for the set is. Sitting 2 years isn't that long, for a set that probably has already been recapped, it should be OK.
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