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(!!!!!) (Best Single #1) 12AU7 Philips Holland NOS 1968 "O" halo (10.5/10.3ma) (same Gm) 1-2% section balance
(!!!!!) (Best Single #1) 12BH7 Super Radiotron Australia gray ribbed plates NOS 1960's (10.8/8.9ma) (similar sound to RCA) (McIntosh, VTL, Manley, Quicksilver)
(!!!!!) (Best Single #1) EF806S=EF86 Telefunken Germany <> bottom NOS 1965 (3.7mA and Gm=2300) (Neumann U67, Shindo, Lawson)
(!!!!!) (Best Single #2) 12AU7 Philips Holland NOS 1972 dimpled disc getter (10.8/11.5ma) 1-5% section balance
(!!!!!) (Best Single #2) 6SN7GTB Tungsol TALL bottle NOS "O" getter 1960 era (7.6/7.6ma)
(!!!!!) (Best Single #2) E88CC=6922 Telefunken Germany <> bottom NOS original box 1963 (16.4ma/18.0ma)
(!!!!!) (Best Single #3) E88CC=6922 Telefunken Germany <> bottom NOS original box 1963 (14.0ma/12.6ma)
(!!!!!) (Best Single #3) ECC83=12AX7 Telefunken Germany ribbed plates used/tests like new 1953-1955 (1.3/1.1ma and Gm=1700/1600) 1-5% section balance
(!!!!!) (Best Single 1959) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates NOS 1959 (1.1/1.0ma and Gm=1700/1600) 1-3% section balance
(!!!!!) (Best Single) 6SN7GTB Tungsol TALL bottle NOS "U" getter 1957 (8.8/9.0ma)
(!!!!!) (Best Single) ECC83=12AX7 Telefunken Germany <> bottom smooth plates NOS 1969 (1.3/1.1ma and Gm=1800/1600)
(!!!!!) (BEST VALUE PAIR #3) 6SN7GTB GE coin-base NOS 1979 same date codes (8.4/8.2ma and 7.4/7.4ma) (Schiit Freya, Rogue)
(!!!!!) (Best Value Pair) 12AT7=ECC81 Telefunken Germany Diamond Bottom <> used/good 1960's (7.6/6.2ma and 6.2/7.2ma)
(!!!!!) (Best Value Pair) 12AX7=ECC83 Philips Miniwatt Holland used/strong 1962-1966 (1.3/1.2ma and 1.1/1.2ma) 1-3% matched
(!!!!!) (Best Value Pair) 6BQ7A RCA black plates NOS "D" getter 1958-1959 (7.6/9ma and 7/9.6ma)
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!!) (Holland Single) 12AU7 Pope Holland NOS 1971 dimpled disc halo (12/13.4ma)
(!!!!!) (INFORMATION) 6N1 or 6N1P (Best Sounding Substitutes = 6BK7B, 6BQ7A, 6BZ7)
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma) (strong Gm)
(!!!!!) (Pair) JAN-7308 Sylvania used/good 1975-1976 (10.8/14.8ma and 13.2/12.0ma) (best 6922 substitute)
