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In Reply to: RE: "Tube Lore" lists the 6670 as a premium 12AU7 (nt) posted by JazzDude on November 6, 2016 at 21:37:10:
George Fathauer in his book "Electron Tube Locator" lists the 6670 as a 12AU7 type but lists only "various sources" as his reference.
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Follow Ups
- RE: "Tube Lore" lists the 6670 as a premium 12AU7 (nt) - Palustris 07:41:27 11/07/16 (0)