(slightly microphonic) 6BC8 Raytheon Japan branded Great Britain NOS 1970's (10.8/12.2ma) (High mA and Gm)

slightly microphonic) 6BC8 Raytheon Japan branded Great Britain NOS 1970's

1 section) 10.8ma Gm=7300

1 section) 12.2ma Gm=7800

- microphonics probably due to high mA and Gm 

Good Ma = 8-10ma

Good Gm = 5500-6000

- close substitute to a 6BS8

- also see 6BZ8