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In Reply to: What does "DR" on the tube box mean? posted by erik on May 2, 2020 at 08:57:05:
I believe that is one of the brothers at vacuumtubes.net. I'm going to assume it means he tested tube.
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Follow Ups
- RE: What does "DR" on the tube box mean? - briney 10:31:35 05/04/20 (0)