(!!!) (Good Value) 12AX7A RCA ribbed plates used/good 1970 era (Gm=1300/1500 and 0.8/1.0ma)
(!!!) (Recommended Pair) 12BH7A Sylvania NOS 1960's - 1970's (9.2/8.5ma and 8.6/9.0ma) (same Gm)
(!!!) (Recommended Pair) 5Y3GT Philips Holland NOS 1960's (58-64/40 and 59-65/40)
(!!!) (Recommended Pair) 5Y3GT Philips Holland NOS 1960's (61-68/40 and 60-68/40)
(!!!) (Recommended Pair) 5Y3GT RCA NOS 1965 and 1969 (58-62/40 and 56-62/40)
(!!!) (Recommended Pair) 6FQ7 GE NOS 1973-1974 (6.5/8.4ma and 7.0/8.0ma)
(!!!) (Recommended Pair) ECC81=12AT7 Mullard UK NOS 1970-1971 branded Amperex an Adzam (9.6/13.4ma and 9.8/14.4ma)
(!!!) (Recommended Siemens Single) ECC81=12AT7 Siemens branded Mullard NOS circa 1970 (10.0/10.8ma)
(!!!) (Recommended Single) 12AU7A RCA clear top used/like new "D" getter halo 1960's (9.0/10.8ma)
(!!!) (Recommended single) 5687 RCA bronze plates NOS 1970 era (38/44.5ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania chrome top gray plates low hours 1950's (8.6ma/8.4ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania NOS 1960's (7.2ma and 6.6ma)
(!!!) (Recommended Single) 6SN7GTB Sylvania used/tests like new 1960's (8.2ma and 7.6ma)
(!!!) (Recommended Single) ECC81=12AT7 Adzam by Mullard UK NOS 1970 (13.2/15.8ma)
(!!!) (Recommended Single) EZ80 Mullard France NOS "O" getter halo 1970 (62/40 and 64/40)
(!!!) (Recommended Single) PCC88=7DJ8 Siemens Germany NOS 1972 (11.5/12.2ma)
(!!!) (Single) 5Y3GT RCA NOS 1951 burgundy base (51/40 and 55/40)
(!!!) (Single) 5Y3GT Tungsol NOS 1962 (56/40 and 62/40)
(!!!) (slightly microphonic) 6922=E88CC Tesla Czech Republic NOS 1970 (22/21ma)
(!!!) (Sylvania Pair #2) 5U4GB Sylvania NOS 1970's (60-62/40 and 60-62/40)