(!!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (18 in stock)
(!!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's in WHITE boxes (4 for $35.49)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (53/40 and 53/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (54/40 and 54/40)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 55/40)
(!!!!) (Best 6X4 Pair) CV4005=6X4 GEC UK black plates NOS 1983 (57/40 and 58/40 x 2 tubes)
(!!!!) (Best PAIR for the money) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52/40 and 53/40 x 2 tubes)
(!!!!) (BEST PRICE) EZ90=6X4 Ultron East Germany 1970 era (4 for $12.99)
(!!!!) (Best U78 Pair) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's same date codes 1% matched (56-56/40 and 56-56/40)
(!!!!) (Recommended 6X4 Pair) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's 1-2% matched (55-58/40 and 56-58/40)
(!!!!) (Recommended Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (54/40 and 54/40 x 2 tubes)
(!!!!) (Recommended Pair) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's 1% matched (55-56/40 and 55-56/40)
(!!!!) (Recommended Single) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's (57/40 and 58/40)
(!!!!) (~ Recommended Pair ~) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note) (52-52/40 and 53-53/40 x 2 tubes)
(!!!) (#1 6X4 GEC UK 1983) CV4005=6X4 GEC UK black plates NOS 1983 (58/40 and 58/40)
(!!!) (#1 6X4W Tungsol from 1955) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (12 in stock) (best sound)
(!!!) (BEST PRICE) JAN-6X4WA Sylvania NOS 1970's (4 for $19.99)
(!!!) (Best Raytheon 6X4) JRP-6X4W Raytheon NOS "D" getter NOS 1953 some production staining around bottom of tube base (59/40 and 60/40)
(!!!) (Best Value) EZ90=6X4 Ultron East Germany 1970 era (8 in stock)
(!!!) (Best Value) JAN-6X4WA Sylvania NOS 1970's (7 in stock)
