(!!!!!) (Best Pair) 8417 Sylvania NOS 1970's same date codes (117.4ma and 118ma)
(!!!!!) (Best Pair) 8417 Sylvania NOS 1970's same date codes (119.5ma and 120ma)
(!!!!) (Best Pair #2) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (10.5/10.4ma and 11.2/10.5ma) 1-3% matched
(!!!!) (Best Pair #2) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (9.5/9.2ma and 10/9.6ma) 1-3% matched (close Gm)
(!!!!) (Best Pair #3) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (10.3/11.0ma and 10.8/10.2ma) 1-5% matched
(!!!!) (Best Pair) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (10.8/12.0ma and 10.8/12.2ma) (very close Gm) 1-2% matched
(!!!!) (Best Pair) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (11.4/11.0ma and 10.8/11.4ma) (very close Gm) 1-2% matched
(!!!!) (Best Pair) ECC81=12AT7 Telefunken Germany <> bottom NOS 1965 (9.0/9.8ma and 9.0/9.6ma) 1-2% matched
(!!!!) (Best Quad) 8417 RCA by Sylvania NOS 1960's - 1970's (100, 101.6, 103, 102ma)
(!!!!) (Best Quad) 8417 RCA by Sylvania NOS 1970's (95.5, 96, 98, 99.6ma)
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 copper grid posts (.7/.8mA Gm=1400/1500)
(!!!!) (Recommended Pair) 8417 Sylvania branded RCA NOS 1972-1973 (119.2ma and 123.7ma)
(!!!!) (Recommended Quad) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971 (9.8/9.8/10.0/10.2ma)
(!!!) (Best Pair) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971-1972 (12.0ma and 12.8ma)
(!!!) (Best Pair) 7868 Sylvania NOS tipped top 1970 era (60ma and 63ma)
(!!!) (Best Single) 8417 Sylvania NOS (111ma)
(!!!) (Best Single) 8417 Sylvania NOS (121ma)
(!!!) (Best Single) EC92=6AB4 Siemens Halske Germany branded Mullard NOS 1964 (10ma)
(!!!) (Best Sylvania Single) 8417 Sylvania NOS branded Westinghouse NOS 1973 (113mA)
(!!!) (Best Value Pair) 7868 RCA NOS 1965-1970 era (47ma and 50ma)
