6EW7 RCA BIG BOTTLE black plates NOS 1961 era (5.4/42ma)

6EW7 RCA BIG BOTTLE black plates NOS 1961 era

1 triode section) 5.3ma Gm=2000

1 triode section) 42ma Gm=6900

Tested on Amplitrex AT1000

Section 1 reference = 4-6ma and Gm=1700-2100

Section 2 reference = 45-50ma and Gm=7000-8000

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

- Woo Audio 6
- Woo Audio 6 SE

RCA made skinny bottle 6EW7
Sylvania made FAT BOTTLE 6EW7