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Original Message
RE: 6188 are getting expensive.
Posted by DAK on April 13, 2017 at 19:17:36:
Actually 5691 and 92 were made mostly by GE for RCA. I guess they had the excess jigs to make them. And not made to the standard of the Bendix tubes, but way above the needs for an ordinary 6sl7 with 10,000 hour lifespan if recommended specs were followed.