(!!!!) (Best Pair #2) JAN-5755 Raytheon Black Plates NOS 1973 (1.6/1.7ma and 1.7/1.8ma) (High Gm)

1 pair) JAN-5755 Raytheon Black Plates NOS most 1973

1 tube) 1.6/1.7ma Gm=1500/1600

1 tube) 1.7/1.8ma Gm=1600/1600

Good Ma 1.5-2.0ma

Good Gm = 1400-1500

Matched on Amplitrex

also see 420A/5755 Western Electric