(!!!) (Best Pair) CK-5755=420A Raytheon clear top NOS 1965 (1.8/1.9ma and 1.8/2.0ma)

1 pair) CK-5755=420A Raytheon clear top NOS 1965

1 tube) 1.8/1.9ma Gm=1400/1500

1 tube) 1.8/2.0ma Gm=1400/1500

Matched on Amplitrex

Vplate=180V

Vgrid=-.1V

Good Ma = 1.5-2.2ma

Good Gm = 1400-1600