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Tom,
John Folsom and myself contracted a local box maker to construct special heavy duty tri-wall corregated boxes with special inserts to hold the 15GP22 tubes. We are quite certain that they will be strong enough to make a round trip via FedEx air freight to RACS and back. We are figuring about $300 each way. We do not feel that is to much considering the value of the tube.
Your 20bp4 is almost as rare and valuable. If I were you I would contract a local box maker to work with you to create a strong shipping container with the correct types of inserts to hold your tube and send it off.
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Vacuum tubes are used in Wisconsin to help heat your house.
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