Triad is one of the early tube manufacturers. They began in 1929 in Pawtucket, RI. Some years later in the 60's or 70's I ran into Triad tubes, but I don't know if they were the same company, a licensed name or even related to the Triad Transformer company. Thanks to Bob Ellingson for this box. Unfortunately, I don't have an example of the one I saw.

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