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(READ REVIEW) 8D8=EF86 Brimar UK quad mica NOS 1961 (3.1ma and 3.2ma) 1-2% matched
(!!!!) (Best Value Pair) JAN-12AT7WC Sylvania black plates NOS 1980 (8.6/7.6ma and 9.0/7.5ma)
(!!!!) (Best Value Pair) 6C4WA Philips JAN by Sylvania NOS 1987 (8.8ma and 9.2ma) (same Gm)
(!!!!) (Recommended Quad) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971 (9.8/9.8/10.0/10.2ma)
6DJ8 Amperex Bugle Boy Holland used/like new 1964 (read review)
(!!!!) (Best Value Single) 12AU7A Sylvania low hours like new 1960's (8.8/8.4ma)
(!!!!) (Recommended Single) 12AY7 GE NOS 1960's (2.2/2.5ma)
(!!!!) (Single) 5692 RCA RED BASE black plates used/good 1953 (7/8ma) (Schiit Saga+)
(!!!!) (Recommended Single) 6350 GE NOS 1960's (11.2/13.2ma)
(!!) 6AN8A Sylvania Magnavox NOS 1972 (14.5/14.8ma)
(!!!!) (Recommended Single) ECC801S=12AT7 Telefunken Germany <> bottom NOS 1966 with warranty sheet (8.5/9.8ma)
(!!!!!) (Oldest Pair 1950's) ECC82=12AU7 Telefunken Diamond Bottom <> ribbed plates NOS 1955-1959 very good printing (9.2/9.0ma and 9.4/9.6ma)
(!!!!) (Recommended Single) EF86 Telefunken Germany <> bottom NOS gray shield 1972 (2.8ma) (Neumann, Lawson, Soundelux, Manley)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!!) (Single) 6922=E88CC Siemens Halske Germany branded RCA gray shield used 1966 (12/9.2ma)
(!!!!!) (Best Pair 1965) 12AU7=ECC82 Telefunken Germany <> bottom smooth plates NOS 1965 (10.6/10.4ma and 9.8/10.9ma) (Close Gm matching)
(!!!!) (Best Overall Pair - A0 Series) 6922=E88CC Siemens Halske Germany gray shield NOS 1962 (18/15ma and 18.4/15.5ma) (Best Overall 6922 Pair) (Phono grade)
(!!!!) 6AK5 GE NOS 1973 (10.2ma)
(!!!!) 76 RCA Cunningham used/good 1930's (4.8ma)
6AK5 Westinghouse NOS 1970 (6.6ma)
