(!!) (Best Pair) 6AF4 RCA NOS 1970”s (23.5ma and 23.8ma)

1 matched pair) 6AF4 RCA NOS 1970”s

1 tube) 23.5ma Gm=8100

1 tube) 23.8ma Gm=8500

Matched on Amplitrex

Good NOS Ma = 15ma

Good NOS Gm = 6500

6DZ4=6AF4A

– Marantz 10B tuner