11-15-2010, 09:48 AM
If you didn't mind using loctals, I see the 7S7 has a higher transconductance (525 umhos) than the 7J7 (290 umhos) and about the same as the 6A7 (520 umhos). Not as high as a 6SB7Y, though.
The 7J7 and the octal 6J8G were used in many 1940 Philco models.
The 7J7 and the octal 6J8G were used in many 1940 Philco models.
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Ron Ramirez
Ferdinand IN