(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!!!) (2nd Best Pair) CV4004=12AX7 Mullard NOS 1981 (0.9/0.9ma and 0.9/1.0ma)
(!!!!) (Best Overall Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1600/1700) (1.3/1.5ma)
(!!!!) (Best Pair) CV4004=12AX7 Mullard UK box plates NOS 1971-1972 (1.1/1.2ma and 1.3/1.1ma)
(!!!!) (Best Pair) GL-0A3 GE NOS 1955 neon (pair)
(!!!!) (Best Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1500/1600) (1.1/1.4ma)
(!!!!) (Recommended Philips Pair) 5814A Philips JAN NOS 1985 (9.5/10.5ma and 10/11.2ma) (same Gm)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1971-1972 (Gm=1500/1500) (1.0/1.1ma)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1500/1600) (0.9/1.1ma)
(!!!!) (Recommended Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1500/1600) (0.9/1.2ma)
(!!!!) (Slightly microphonic Single) CV4004=12AX7 Mullard box plates NOS 1981 (Gm=1400/1500) (0.8/1.1ma)
(!!!) (Recommended Pair) 6V6GT Sylvania coated glass NOS 1950's (39.0/40.6ma)
(!!!) (Recommended Pair) 6V6GTA Sylvania coin-base NOS 1970's (37ma and 39.2ma)
(!!!) (Recommended Pair) 6V6GTA Sylvania coin-base NOS 1970's (45.6ma and 49.8ma)
(!!!) (Recommended Pair) 6V6GTA Sylvania NOS 1960's (37.5ma and 39.5ma)
(!!!) (Recommended Pair) 6V6GTA Sylvania NOS 1960's - 1970 (45.5ma and 48.5ma)
(!) (slightly microphonic single) CV4004=12AX7 Mullard NOS 1981 (1.3/2.1ma)
(slightly microphonic) E182CC=7119 Amperex USA low hours/like new 1981, pins cleaned and straightened (45.5ma/49ma) (High Ma and Gm)
412A Western Electric NOS 1981 (54/40 and 54/40)
6189W GE JAN NOS 1981 (8.4/9.0ma)