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(!!!!!) (Best Overall Single) CK-5687WB Raytheon black plates NOS 1960's (40.5ma/42ma) (Audio Note, Modwright, Manley) Highest mA and Gm
(!!!!!) (Best Overall Single) ECC801S=12AT7 Telefunken Germany <> bottom NOS 1963 (10/9.6ma)
(!!!!!) (Best Value Pair) 12AT7=ECC81 Telefunken Germany Diamond Bottom <> used/good 1960's (7.6/6.2ma and 6.2/7.2ma)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (56-58/40 and 57-58/40)
(!!!!!) (Recommended Pair) 5U4GB HYTRON NOS 1960 "O" getter halos (60-64/40 and 60-66/40)
(!!!!!) (Recommended Pair) E80CF=7643 Valvo branded Philips Miniwatt SQ NOS 1963 (PREMIUM 6BL8 SUB) (Tuners)
(!!!!!) (Single) 12BH7 Super Radiotron Australia gray ribbed plates NOS 1960's (9.8/14.2ma) (similar sound to RCA) (McIntosh, VTL, Manley, Quicksilver)
(!!!!) (Best Pair #3) ECC81=12AT7 Mullard UK NOS 1968-1970 (9.4/11.2ma and 9.8/11.2ma) 1-3% matched (sweet sound)
(!!!!) (Best Pair) 8D8=EF86 Brimar UK quad mica NOS 1961 (2.9ma and 3.0ma) 1-2% matched
(!!!!) (Best Single #2) ECC803S=12AX7 Telefunken Qualitex Ulm Germany <> bottom like new 1964 (1.3/1.5ma and Gm=1600/1800)
(!!!!) (Best Single 1958) 6922 Amperex Holland curved "D" getter 1958 NOS (16.2/17.8ma) (same sonics as pinched waist version)
(!!!!) (Best Single 1961) 12AX7=ECC83 Philips Miniwatt Holland 1961 large "O" getter halo NOS (1.8/1.3ma and Gm=2100/1700)
(!!!!) (Best Single 1966) 12AX7 Philips Holland NOS 1966 (Gm=1700/2100 and 1.2/1.7ma)
(!!!!) (Best Single) 6550 Tungsol branded RCA NOS vented plate NOS 1965 (130ma) (Recommended for Audio Research Ref power supply)
(!!!!) (Best Single) 6SN7GT CBS parallel black plates NOS, similar to VT-231 Sylvania 1950 era (8.8/9.4ma)
(!!!!) (Best Value 1960) 12AX7 Philips Miniwatt Holland low hours/tests like new 1960 (Gm=1600/1600 and 1.0/1.3ma)
(!!!!) (Best Value Pair #1) 6B4G Raytheon NOS 1940's separate plates in white boxes (89ma and 92ma)
(!!!!) (Best Value Pair) 6B4G Raytheon NOS 1940's separate plates, 1 branded Philco (90ma and 91.5ma)
(!!!!) (Best Value Pair) 6V6GT GE coated glass NOS 1952 same date codes (56ma and 59ma)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
