(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1972-1973 (9.6/10.6ma and 9.3/10.4ma) 1-3% matched
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (4.8, 4.9, 5.1, 5.2ma)
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (6.3, 6.3, 6.4, 6.5ma)
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (6.6, 6.7, 6.8, 6.8ma)
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (6.9, 6.9, 7.1, 7.2ma)
(!!!!) (Recommended Single 1964) 6DJ8 Amperex Bugle Boy Holland Tektronix Checked "o" getter halo tests like new 1964 (15.5/15.6ma) 1-2% section balance
(!!!!) (Recommended Sylvania Pair) USN-CHS-6922 Sylvania gold pins NOS same date codes "O" getter halos 1964-1965 (11/13ma and 11.0/11.5ma)
(!!!) (Best Pair) JAN-CEA-5852=6X5GT Bendix NOS 1953 (63-64/40 x 2 sections) 1% matched (Best Audio Grade 6X5GT)
(!!!) (Best RCA Pair) 6X5GT RCA black plates NOS 1953 (50-54/40 and 50-53/40)
(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!!) (Best Single EC86) EC86 Telefunken gold pins NOS 1964 (13ma)
(!!!) (Best Single) 6189=12AU7WA=E82CC Sylvania NOS 1960's in white box (10/10.2ma) (Same Gm) 1-2% section balance
(!!!) (Best used single) 12AT7 Telefunken Diamond Bottom used/good 1960's (10.0ma/10.8ma)
(!!!) (Best Value Single) 12AU7A RCA CANADA (Philips Plant) NOS 1964 same build as Mullard UK (9.0/9.2ma) 1-2% section balance
(!!!) (Best Value SIngle) EF86 Valvo Germany branded Philips NOS 1970 (4.4ma) (highest Ma and Gm)
(!!!) (Best Value Single) EL84 Mullard England used/good 1963 (45.8ma)
(!!!) (Good Value Single) 12AT7 Tungsol NOS 1960's (6.4/8.4ma)
(!!!) (Recommended Pair) JAN-6189=12AU7WA Sylvania NOS 1973-1974 (8.4/9.8ma and 9.2/9.6ma)
(!!!) (Recommended Single) 12AT7 Tungsol rebranded AKRAD "U" getter NOS 1956 (6.2/6.6ma)
(!!!) (Recommended Single) CV378=GZ37 Mullard NOS "O" getter halo 1967 (50/40 and 50/40)