(!!) 6350 Sylvania black plates rebranded United "U" getter used/good 1950's (8.7/9.3ma)

1 tube) 6350 Sylvania black plates rebranded United "U" getter used/good 1950's

1 section) 8.7ma Gm=4300

1 section) 9.3ma Gm=4300

Tested on Amplitrex

Vplate=150V

Vgrid=-5V

Good NOS Ma per section = 9-11ma

Good NOS Gm per section = 4500-5000