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Yes by all means try soldering the heater pins. I have had at least a couple of bad solder joints on the filiment pins. Heat it up with a 100 watt iron and let it suck some solder into the tip of the pin. If the original solder connection was marginal, it is possible that the heat of the tube combined with the heavy current of 3 filiments going through the pins, may have caused the solder joint to fail.
Hawkeye can rebuild it if it is under vacuum. He can not guarantee that it will be a success, because sometimes a metal tube will crack the face of the tube during the rebuilding. That said, another AK member has had Hawkeye do a successful rebuild of a 21axp22 and was very pleased with the results. I believe the cost is about $350 plus shipping.
Good luck and let us know what you find. Hope it has not gone to air.
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Vacuum tubes are used in Wisconsin to help heat your house.
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