(!!!!!) (Best Single) 5687 GE 5 Star NOS 1973 (37.5ma/33.5ma) (Audio Note, Modwright)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (56/40 and 56/40) 1% balance
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (56/40 and 56/40) 1% diode balance
(!!!!!) (Best Value Pair) GL-6072 GE 5 star triple mica black plates "O" getter halo 1962 like new (2.9/3.1ma and 3.1/2.9ma) 1-2% matched (Audio Note, Kondo, mics)
(!!!!!) (Recommended Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (56/40 and 60/40)
(!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (10 in stock)
(!!!!) (Best Single 1961) 5687 GE 5 Star NOS 1961 (33ma/37ma) (Audio Note, Modwright)
(!!!!) (Best Sylvania Pair) 6X5GT Sylvania NOS 1951 (50-53/40 and 52-53/40)
(!!!!) (Best Value) JTL-6X4 Tungsol 1950's curved "D" getter low hours/like new reprinted in 1977 (58/40 and 60/40)
(!!!!) (Best Value) JTL-6X4 Tungsol 1950's curved "D" getter low hours/like new reprinted in 1977 (60/40 and 60/40)
(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (53-54/40 x 2 tubes)
(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (52-54/40 and 51-53/40 x 2 tubes)
(!!!) (Best 6112 Pair) 6112 Philips JAN 1980's (.7/.7ma and .7/.8ma) 1-2% matched (Audio Note, Musical Fidelity)
(!!!) (BEST MULLARD PAIR) ECL82=6BM8 Mullard UK branded Philips and Sylvania NOS 1966-1972 (2.2/2.5ma and 32/32ma)
(!!!) (Best Pair 1944) JAN-CHS-6X5GT Sylvania 1944 NOS (53/40 and 54/40 x 2 tubes)
(!!!) (Best Pair) 180C1=0B2 Valvo France like new 1959 (argon gas)
(!!!) (Best Pair) 6BM8=ECL82 Philips Holland made in Belgium NOS 1969 (1.8ma/31ma and 1.9/30ma) 1-2% matched
(!!!) (BEST PAIR) JHY-0B2WA CBS NOS 1960 (neon gas) (1 pair)
(!!!) (Best RCA Pair) 6X5GT RCA black plates NOS 1953 (50-54/40 and 50-53/40)