(!!) (SINGLE) 12AU7 RCA long plates D getter NOS 1950's (9.2/9.8ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (7.5/9.6ma and 7.5/9.2ma)
(!!!) (Best Value Pair) 12AU7A RCA NOS 1960's faded printing (9.3/11.8ma and 10.6/9.0ma)
(!!) (BEST VALUE SINGLE) 12AU7A RCA clear top used/good 1960's (8.0/9.4ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
(!!) 12AU7A RCA clear top used/good 1964 (8.2/8.6ma)
(!!!) (Best Single) 12AU7A RCA clear top NOS 1973 (10.8/11ma) (same Gm) 1-2% section balance
(!!) (Recommended Single) 12AU7A RCA clear top NOS 1973 (11.6ma/12.6ma) (High Gm)
(!!!!) (Recommended Single) 12AU7A RCA clear top NOS 1969 (10.6/12.0ma)
(!!!!!) (Best Value Pair) 12AU7A RCA NOS 1964-1965 (8.2/11ma and 8.8/10.4ma)
(!!) 12AU7A CBS black plates NOS 1960 era (9.5/11.8ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (8/10ma and 8/9.5ma)
