(!!) (Recommended Pair) ECC40 Siemens NOS made by La Radiotechnique, Chartres/France 1967-1972 (6.1/6.4ma and 6.0/6.0ma)
(!!) (Recommended Single 1961) JLRV-12AT7WA=6201 GE Canada gray plates triple mica "U" getter NOS 1961 (9/12ma)
(!!) (Recommended Single) 12AU7A RCA top getter NOS 1970 era (10.2/11ma)
(!!) (Recommended Single) 311B Western Electric NOS 1967 glass slightly tilted, large getter, in white box (33ma)
(!!) (Recommended Single) 5814A=12AU7 Hyperlec Brive France (Holland clone) NOS 1970's rebranded National (11.8/12.2ma)
(!!) (Recommended Single) 6350 RCA NOS rebranded United triple mica "U" getter halo 1950's (9/9.6ma)
(!!) (Recommended Single) 6350 Sylvania black plate NOS "U" getter halo 1957 (9/10ma)
(!!) (Recommended Single) 6AK5 Tungsol gray plate NOS 1956 (8.3ma)
(!!) (Recommended SINGLE) 6C4WA GE JAN NOS 1972 (10.6ma)
(!!) (Best CBS Single) 6SN7GTB CBS black plates side-getter NOS, the same shape as Sylvania 6SN7GTB 1959 (8.0/8.2ma)
(!!) (recommended Single) 6SU7GTY=6188 Tungsol 1950's rebranded "5691 NATIONAL" in 1980's black ribbed plates "D" getter halo triple mica (2.3/2.5ma)
(!!) (Recommended Single) 6U8A GE NOS 1977 (14.2ma/10ma)
(!!) EC92 Siemens Halske NOS rebranded Philips Miniwatt 1968 "O" getter halo (6.8ma)
(!!!) (Recommended Single) EC92=6AB4 Siemens Halske NOS 1967 (9.2ma)
(!!) (Recommended Single) JAN-CRP-5687WA Raytheon black plates tests like new 1962 partiailly faded printing (33.2/35.4ma)
(!!) (Recommended Single) JG-5751 GE gray plates double mica "O" getter NOS 1965 (2.1/2.1ma)
(!!) (Recommended Sylvania) 6EU7 Sylvania branded RCA NOS 1970's (68/32 and 76/32)
(!!) (Recommended Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!) (Slightly Microphoinic Single) 6072A RCA black plates NOS 1971 (2.6/3.0ma)
(!!) (slightly microphonic single) 12BZ7 RCA gray plates NOS 1966 (2.3/3.0ma)
