(!!!!!) (Best Overall Pair) 5687 GE "5-Star" NOS 1969 (30.0/30.5ma and 30.5/32.5ma) 1-3% matched
(!!!!!) (Best Overall Pair) 5687 GE "5-Star" NOS 1969 1-2% matched (31.5/33.5ma and 31/32.5ma) (Modwright, Audio Note, Manley, Ayon)
(!!!!!) (BEST OVERALL QUAD) 5687 GE "5-Star" NOS 1969 1-2% matched (Audio Note, Kondo, Modwright, Manley, Ayon)
(!!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (0 in stock)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 56/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (57/40 and 58/40)
(!!!!!) (Best Sylvania Pair) JHS-5687WA Sylvania NOS 1964 same date codes (33/34.2ma and 35.6/36.3ma)
(!!!!) (Best 6112 Pair) 6112 Philips JAN 1985 (.9/.9ma and .9/1.0ma) 1-2% matched (Audio Note, Musical Fidelity)
(!!!!) (Best Overall EI Pair) ECL82=6BM8 EI Yugo branded RSD Germany NOS 1974 1-3% matched
(!!!!) (Best PAIR for the money) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52-54/40 x 2 tubes)
(!!!!) (Best Single) 5687 GE 5 Star NOS 1969 (31.0ma/31.5ma) (Audio Note, Modwright)
(!!!!) (Best Value Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52-53/40 x 2 tubes)
(!!!!) (Best Value Single) ECL82=6BM8 Telefunken Germany <> bottom low hours/tests like new 1970 era rebranded Siemens (2.3ma/35.4ma)
(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (53-54/40 x 2 tubes)
(!!!!) (Recommended pair) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note, Shindo, LAMM) (52-56/40 x 2 tubes)
(!!!!) (Recommended Single) 5Z4G Brimar UK black plates NOS 1950's (57/40 and 58/40) (recommended for Audio Note)
(!!!) (2nd Best Pair) 6X5GT Tungsol "D" getter NOS 1950's same date codes (50-52/40 and 50-51/40)
(!!!) (BEST MULLARD PAIR) ECL82=6BM8 Mullard rebranded Philips NOS 1973-1974
(!!!) (Best Pair) 6X5GT GE Canada NOS 1967 same build as 6X5GT RCA (58/40 and 60/40 x 2 tubes) 1% matched
(!!!) (Best Raytheon 6X4) JRP-6X4W Raytheon NOS "D" getter NOS 1953 some production staining around bottom of tube base (59/40 and 60/40)
