(!!!) (Recommended Pair) 5963 gray plates NOS 1967-1973 (9.4/9.09ma and 8.4/9.0ma)

1 low noise pair) 5963 CMC Computer Measurements Company by RCA gray plates test like new 1962 era in white boxes

1 tube) 9.4/9.0ma Gm=2200/2100 (1973)  

1 tube) 8.4/9.0ma Gm=2000/2100 (1967)

NOS mA range 8-10mA

NOS Gm range 1800-2200+

(5963=computer rated 12AU7)