6B4G Sylvania branded RCA NOS 1940 era (100ma)
$ 44.99
6B4G Sylvania branded RCA NOS 1940 era original box
100ma
Gm=6500
Good current range 70-90ma
(6B4G=6.3V filament)
(6B4G is electrically equivalent to 6A3, but 6A3 has UX-4 pin base and 6B4G has 8 pin octal base)
(The best sounding 6B4G are 1940's-1950's: Ken Rad, Tungsol, Sylvania, Raytheon)
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