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Blue Tubes
Blue glass did nothing for the performance of a tube but marketing folks loved it. The far left tube is a Rextron. The one next to it is a Fultone 01A. The rest are Arcturus tubes, the most common ones found. Included are 01A, PZ, 80, 127, 71A, and the one with the red bottom is a Wunderlich.

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Copyright 2003-2004 Howard Stone PhD.
stonevintageradio@gmail.com