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(!!!!) (BEST PAIR #1) 6C4WA GE JAN NOS 1980-1984 (9.8/10ma)
(!!!!) (BEST PAIR #2) 6C4WA GE JAN NOS 1980-1982 (8.4/8.4ma) 1% matched
(!!!!) (BEST PAIR #3) 6C4WA GE JAN NOS 1980-1981 (8.6/9.0ma) (Same Gm)
(!!!!) (BEST PAIR) 6C4WA GE JAN NOS 1973-1980 (8.4/8.2ma)
(!!!!) (Best Value Pair) 6C4WA Philips JAN by Sylvania NOS 1987 (7.4ma and 7.2ma)
(!!!!) (Best Value Pair) 6C4WA Philips JAN by Sylvania NOS 1987 (8.2ma and 7.6ma)
(!!!!) (Best Value Pair) 6C4WA Philips JAN by Sylvania NOS 1987 (8.8ma and 9.2ma) (same Gm)
(!!!!) (Pair) 6C4WA GE JAN NOS 1971-1973 (8.2/8.4ma) 1-2% matched (Conrad Johnson)
(!!!) (Best Single) JAN-6C4WA Philips by Sylvania NOS 1987 (10.2ma)
(!!!) (Single 1966) 6688=E180F Siemens Holland NOS gold pins 1966 (8ma)
(!!!) (Single) 6688=E180F Amperex PQ USA NOS "O" getter 1968 (9ma)
(!!!) (Single) JAN-6C4WA GE NOS 1972 (8.8ma)
(!!) (Best Single) E180F=6688 Philips Miniwatt SQ Holland gold pins "D" getter NOS 1957 (14.2ma)
6100=6C4WA GE 5 star triple mica NOS 1959-1960 (12.6ma) (Premium 6C4)
6688=E180F National UK black plate NOS probably made by Amperex (9ma)
6688=E180F National UK gray plate NOS probably made by Amperex (16ma)
6688=E180F Philips Miniwatt Holland SQ gold pins used/good 1966 (8.8ma)
6C4WA Sylvania NOS 1965 and 1971 (read review)
