(!!!) (Best Pair) 6CS7 RCA gray plates NOS 1970 era (20/10.6ma and 21/12.2ma)

1 matched pair) 6CS7 RCA NOS tall gray ribbed plates 1970 era

1 tube) 20ma/10.6ma Gm=4300/3000

1 tube) 21ma/12.2ma Gm=4700/3100

Matched on Amplitrex

Good Ma triode #1 = 20ma Good Gm = 4000-4500

Good Ma triode #2 = 10ma, Good Gm = 2000-2200

for:

Leben CS 600 integrated amp
Leben CS 660P power amp