(!!!!) (Recommended Pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970-1972 (4.9/4.6ma and 42/43ma)

1 matched pair) 6EW7 Hitachi Japan branded Westinghouse BIG BOTTLE NOS 1970 era

1 tube) 4.9ma Gm=2000 and 42ma Gm=7800

1 tube) 4.6ma Gm=2000 and 43ma Gm=8000

(6EW7 is a close substitute to the 6DE7)

– Woo Audio 6
– Woo Audio 6 SE

RCA made skinny bottle 6EW7
Sylvania and Hitachi Japan made FAT BOTTLE 6EW7