(!!!!!) (Best Pair) E80CC=6085 Philips SQ Holland NOS 1972 (6.4/6.9ma and 6.2/6.5ma)
(!!!!!) (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 6112 Pair) 6112 Philips JAN 1985 (.9/.9ma and .9/1.0ma) 1-2% matched (Audio Note, Musical Fidelity)
(!!!!) (BEST GE QUAD) JAN-5687WA GE NOS 1968-1969 (matched quad)
(!!!!) (Best PAIR) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (56-56/40 and 56-56/40 x 2 tubes)
(!!!!) (Best PAIR) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (57-57/40 and 56-57/40 x 2 tubes)
(!!!!) (Best PAIR) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (54-55/40 and 54-55/40 x 2 tubes)
(!!!!) (BEST PAIR) 7119 Amperex USA NOS "O" getter halo 1981 (41ma/44ma and 42/43ma)
(!!!!) (BEST PAIR) E80CC=6085 Siemens Holland NOS 1966 (6.7/8.0ma and 6.4/7.5ma)
(!!!!) (BEST PAIR) E80CC=6085 Siemens Holland NOS 1967 (5.9/6.4ma and 5.5/6.6ma)
(!!!!) (Best Pair) ECL82=6BM8 EI Yugo branded RSD Germany NOS 1974 1-3% matched
(!!!!) (Best Quad) E80CC=6085 Philips SQ Holland NOS 1971-1972 (5.8/6.2, 5.8/6.6, 5.5/6.4, 5.2/6.2ma)
(!!!!) (Best Quad) E80CC=6085 Philips SQ Holland NOS 1971-1972 (5.9/6.9, 5.5/6.9, 5.7/6.7, 5.5/6.7ma)
(!!!!) (Best Telefunken Single) ECL82=6BM8 Telefunken Germany <> bottom low hours/tests like new 1970 era rebranded Siemens (2.3ma/35.4ma)
(!!!!) (Best Value Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (51-52/40 and 52-52/40 x 2 tubes)
(!!!!) (Best Value Pair) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note, Shindo, LAMM) (50-54/40 and 51-55/40)
(!!!!) (Recommended 6X4W) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (54/40 and 56/40) slightly tilted glass
