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In Reply to: Motorola 12AT7-8M tubes posted by FenderLover on December 5, 2018 at 21:49:30:
I'm pretty sure that's just part of their brand-specific model number. I used to service Motorola and other brands of tube-type communications gear. I don't recall any of those companies using nomenclature to designate tube grading or special performance options.
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Follow Ups
- RE: Motorola 12AT7-8M tubes - Triode_Kingdom 19:33:33 12/06/18 (3)
- RE: Motorola 12AT7-8M tubes - Eli Duttman 02:26:52 12/07/18 (2)
- RE: Motorola 12AT7-8M tubes - dogma 15:59:52 12/24/18 (0)
- RE: Motorola 12AT7-8M tubes - Triode_Kingdom 15:06:32 12/15/18 (0)