(!!!!!) (Best Overall Single) ECC83=12AX7 Telefunken Germany smooth plates NOS 1965 (1.3/1.5ma and Gm=1800/2000) (Highest mA and Gm)
(!!!!!) (Best Pair) JG-5751WA GE black plate triple mica U getter like new 1958 (2.3/2.3ma and 2.4/2.3ma)
(!!!!!) (Best Pair) JG-5751WA GE gray plates triple mica U getter like new 1955 (2.3/2.1ma and 2.2/2.1ma)
(!!!!!) (Recommended Single) JG-6072 GE triple mica black plates "O" getter NOS 1962 (3.1/3.2ma) (AKG, Tele 251, Peluso, Rode) (similar sound to 5-Star GE) (same Gm)
(!!!!) (Best Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 1-2% matched (10.2/10.4ma and 10.2/10.6ma)
(!!!!) (Best RCA 1955) 12AX7 RCA black plates "D" getter NOS 1955 (Gm=1800/2000 and 1.2/1.5ma) (rare tube)
(!!!!) (Best Single 1958) 5751 Sylvania black plates triple mica D getter halo 1958 like new (2.5/2.3ma)
(!!!!) (Best Single 1964) USN-CHS-5751W1 Sylvania NOS gray plates triple mica O getter halo 1964 (2.7/2.5ma) (same Gm)
(!!!!) (Best Single) 12BH7 GE NOS gray oval plates "U" getter 1953 (13.8/14.2) (Quicksilver, Wells, Doshi, McIntosh)
(!!!!) (Best Single) 5692 RCA RED BASE black plates like new 1950 (10.0/9.2ma)
(!!!!) (BEST SINGLE) 5U4GB Raytheon "O" getter NOS 1962 (57/40 and 57/40) 1% diode balance
(!!!!) (Best Single) 6SN7GTB RCA NOS 1958 side getter (9.6/9.8ma)
(!!!!) (Best Single) 6SN7GTB RCA NOS 1960 (10/11ma) (Highest Gm)
(!!!!) (Best Sounding Pair) 5Y3GT RCA Motorola NOS 1960 (56-61/40 and 56-62/40)
(!!!!) (Best Value Pair 1960) 12AX7=ECC83 Mullard UK ribbed plates used/good 1960 (161 Series) (0.8/1.0ma and 0.8/1.0ma) 1-2% matched
(!!!!) (Best Value Pair 1965 era) 12AX7=ECC83 Philips Miniwatt Holland like new 1964-1965 era (1.3/1.2ma and 1.1/1.2ma)
(!!!!) (BEST VALUE SINGLE) 5U4GB Raytheon "O" getter NOS 1962 (57/40 and 58/40)
(!!!!) (BEST VALUE SINGLE) 5U4GB Raytheon "O" getter NOS 1962 (58/40 and 60/40) (2 in stock)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
(!!!!) (Good Value 1962) M8137=12AX7S Philips SQ France ribbed plates NOS 1962 (0.8/0.9ma and Gm=1350/1350) (Special Quality 12AX7)
