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DuMont did seem to have a good presence in the tube business for a time. Something I've noted on the boxes: older ones have the initials A.B.D. (I think), newer ones, E.R.P.(I was able to confirm that). There is a discussion somewhere here or on the ARF about what happened to the DuMont tube business. I think it was seperate from Emerson and I don't know that they actually made tubes later on, just marketed them. The DuMont TV I have naturally uses all DuMont branded tubes but with the newer logo, and all made in Japan. Meanwhile, boxed DuMont tubes from that era use the older logo and tend to be US sourced.
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Bryan
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