6CS7 Raytheon by Toshiba Japan gray plates NOS 1970 era (21.5/10.2ma)

6CS7 Raytheon by Toshiba Japan gray plates NOS 1970 era

21.5ma Gm=5000

10.2ma Gm=2200

Matched on Amplitrex

Good Ma triode #1 = 20-25ma, Good Gm = 4000-5000

Good Ma triode #2 = 10-12ma Good Gm = 2000-2400 

for:

Leben CS 600 integrated amp
Leben CS 660P power amp