(!!!) (Best Single) 12AU7A RCA clear top NOS 1973 (10.8/11ma) (same Gm) 1-2% section balance
(!!) (BEST VALUE SINGLE) 12AU7A RCA clear top used/good 1960's (8.0/9.4ma)
(!!) (Recommended Single) 12AU7A RCA clear top NOS 1973 (11.6ma/12.6ma) (High Gm)
(!!) 12AU7A CBS black plates NOS 1960 era (9.5/11.8ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
(!!) 12AU7A RCA clear top used/good 1964 (8.2/8.6ma)
(!) 17BF11 GE NOS 1983 (78-80/60) (CAYIN)
17BF11 RCA like new (80-82/60) (CAYIN)
