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(!!!!) (BEST OVERALL SINGLE) 12AU7A GE NOS 1958 copper grid posts (11.8/11.4ma) 1-3% section balance
(!!!!) (BEST SINGLE 1985) 12AU7A GE NOS 1985 copper grid posts (9.2/9.4ma) 1-2% section balance
(!!!!) (SINGLE) 12AU7A GE NOS 1963 copper grid posts (8.9/10.2ma)
(!!!!) (SINGLE) 12AU7A GE NOS 1972 copper grid posts (10.6/9.8ma) (warm and smooth)
(!!!!) (SINGLE) 12AU7A GE NOS 1976 copper grid posts (9.4/8.8ma)
(!!!) (Best Pair) 6AC7=1852=VT-112 RCA low hours/tests like new 1940's (11.4/12.4ma)
(!!!) (BEST PRICE) 12AU7A GE used/good 1969 - 1980 (4 for $29.99)
(!!!) (BEST PRICE) 12AU7A GE used/good 1971 - 1978 (4 for $29.99)
(!!!) (PAIR 1940's) 6AC7 RCA used/good 1941-1942 (7.8/7.5ma)
(!!!) (Pair) JAN-CRC-6AC7=VT-112 RCA 1941-1946 used/good (8.4/9.4ma)
(!!!) (Recommended Pair) 12AU7A GE NOS 1965-1975 (8.8/8.8ma and 9.2/8.8ma) (Same Gm) (smooth and warm)
(!!!) (Recommended Single) 12AU7A GE NOS 1963 (8.6/9.5ma)
(!!!) 12AU7A GE "U" getter like new 1959 (10.8/10.2ma)
(!!!) 12AU7A GE "U" getter low hours/tests like new 1957 (10.0/8.8ma)
(!!) (BEST PRICE) 6AC7 Mixed US Brands (4 tubes for $14.99)
(!!) (BEST PRICE) 6AC7W RCA used/good (4 tubes for $8.99)
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance
(Pair) 6AC7=1852 Ken Rad used/strong 1940's (9.6/10ma)
(READ REVIEW) 6AC7 RCA NOS 1957-1965 (9.2/9.2ma) 1-2% matched
6AC7 CBS NOS 1960 era (9.6ma)
