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(!!!!) (Best Value Single) ECC82=12AU7 Telefunken Germany <> Bottom ribbed plates NOS 1969 faded printing (10.8/10.0ma) (Highest Gm)
(!!!!!) (Best Pair) EF86 Siemens Germany made by Valvo (Hamburg) NOS 1965 (3.4ma/3.4ma) 1-2% matched
(!!!!!) (Best Pair #3) EF86 Valvo Germany branded PHILIPS and POPE NOS 1970 (3.6ma/4.0ma)
(!!!) (Recommended Single) 12AT7 Tungsol rebranded AKRAD "U" getter NOS 1956 (6.2/6.6ma)
(!!!!!) (Best Single) E81CC=6201=12AT7 Philips Mullard UK SQ NOS gold pins 1974 (9.6/10ma) 1-3% section balance
6463 GE 5 Star NOS 1960 (14/20ma)
6463 GE NOS 1965 (20.5/14ma)
6DJ8 GE NOS 1964 orange printing (12.6/16.4ma)
(!!!!) (SINGLE) 6BL7GTA RCA NOS 1966 (33.4/33.0ma)
407A Western Electric NOS 1974 (32/26 and 34/26)
(!!!) (Best Value Single) ECC83=12AX7 Siemens Halske Germany used/good 1960's faded date code (1.3/0.9ma and Gm=1700/1500)
GL-6463 GE NOS "U" getter halo 1955 (11/12.8ma)
GL-6463 GE NOS "U" getter halo 1955 (14/20ma)
(!!!) (Good Value Single) JAN-6189=12AU7WA Sylvania NOS 1960 era in white box (8.6/10ma)
(!!!) (Best Single) ECC83=12AX7 Siemens Halske Germany NOS 1966 (162 Series) (Gm=1500/1600 and 1.0/1.1ma)
(!!!!) (Best Value Single) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates branded GAP/R Computor tube used/good 1956 (Gm=1400/1500 and 0.8/0.9ma) 1-5% section balance
(!!) (Best Pair) 12SL7GT GE NOS 1973 (2.9/2.9ma and 2.7/2.6ma)
(!!!) (Single) JAN-6189=12AU7WA Sylvania NOS 1978 (9.2/8.8ma) (same Gm)
(!!!) (Single) JAN-6189=12AU7WA Sylvania NOS 1968 (8.2/9.4ma)
(!!!) JHS-6189=12AU7WA Sylvania NOS 1965 in white box (10/9ma)
