(!!!!!) (BEST PRICE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (18 in stock)
(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 55/40)
(!!!!) (Best PAIR for the money) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (52/40 x 4 sections)
(!!!!) (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)
(!!!!) (Best U78 Single) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's (57/40 and 57/40)
(!!!!) (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)
(!!!!) (~ Best U78 Single ~) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's (57/40 and 57/40)
(!!!!) (~ Recommended Pair ~) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (53/40 x 4 sections)
(!!!!) (~ 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 Raytheon 6X4) JRP-6X4W Raytheon NOS "D" getter NOS 1953-1954 original boxes (6 in stock)
(!!!) (Best Value) EZ90=6X4 Ultron East Germany 1970 era (8 in stock)
(!!!) (Best Value) JAN-6X4WA Sylvania NOS 1970's (7 in stock)
(!!!) (~ Best CV4005 Pair ~) CV4005=6X4 GEC UK black plates NOS 1983 (57/40 and 58/40 x 2 tubes)
(!!!) (~ Best Tungsol from 1955 ~) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (54/40 and 54/40) 1% section balance
(!!!) (~ Best Tungsol from 1955) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (57/40 and 57/40) 1% section balance
(!!!) (~ Recommended Pair ~) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note, Shindo, LAMM) (55-59/40 and 56-58/40)
(!!) (#1 6202 Pair) 6202 GE branded RCA NOS 1979 (recommended)
(!!) (#1 6X4 Sweden pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1% matched (53-54/40 x 2 tubes)
