(!!!!) (Good Single 1950) 12AU7 Sylvania black plates "D" getter NOS 1950 (11/12.8ma)
(!!!!) (Good Value Single) 6SN7GTA GE "U" getter halo used/good 1954 (6.0/6.4ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (33.2ma and 34.2ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (35.2ma and 34.0ma)
(!!!!) (Recommended Pair) 6F6G Marconi Spain NOS 1940's (37.5ma and 39ma)
(!!!!) (Recommended Pair) 6K6GT Sylvania black plate NOS 1960's - 1970 same build (46.6ma and 48ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!) (Best Pair) 12BA6 Sylvania NOS 1960's (10.4ma / 10.6ma) 1-3% matched
(!!!) (Best Pair) 6B4G Sylvania rebranded GE 1952 separate plates NOS (87ma and 87.5ma) (High Ma and Gm)
(!!!) (Best Pair) 6SL7GT RCA NOS black plates gray coated glass 1959-1960 (2.2/2.3ma and 2.2/2.3ma)
(!!!) (BEST PAIR) 7AF7 Sylvania NOS gray round plates NOS 1950-1958 (8.5/8.7ma and 9.2/9.2ma) 1-5% matched (same Gm)
(!!!) (Best Single) 403A Western Electric NOS "D" getter 1955 (10.2ma)
(!!!) (Best Single) 6F6G Marconi Spain NOS 1940's (35.8ma)
(!!!) (Best Single) 6F6G Marconi Spain NOS 1940's (44ma)
(!!!) (Best Sounding Pair) 80 Sylvania Philco NOS 1950 (52-57/40 and 53-58/40)
(!!!) (Best Sounding Pair) 80 Sylvania Philco NOS 1950 (54-57/40 and 56-58/40)
(!!!) (Best Value Pair) 6B4G Sylvania NOS 1952 same build (76ma and 80ma)
(!!!) (Best Value Pair) 807 RCA black plate NOS and used 1970-1975 (67.5ma and 65.2ma)
(!!!) (Recommedned Pair) 6B4G Sylvania NOS 1940's, 1 tube rebranded RCA - same build (106mA and 107mA)