(!!!!) (#1 U78=6X4 Pair) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's (56-56/40 and 56-56/40) 1% matched
(!!!!) (~ Best U78 Pair ~) U78=6X4 GEC black plates branded MWT (Marconi Wireless Telegraph) UK NOS "D" getter halo 1950's 1% matched (55-55/40 and 55-55/40)
(!!!!) (~ 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 Raytheon 1953-1954) JRP-6X4W Raytheon NOS "D" getter NOS 1953-1954 original boxes (9 in stock)
(!!!) (#1 6X4W Tungsol from 1955) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (12 in stock) (best sound)
(!!!) (~ 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
(!!!) (~ Best Value - Best Sound 6X4 ~) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (18 in stock)
(!!!) (~ Best Value ~) JAN-6X4WA Sylvania NOS 1970's (9 in stock)
(!!!) (~ Recommended Pair ~) JTL-6X4W Tungsol NOS 1955 curved "D" getter halo (best sound) (recommended for Audio Note, Shindo, LAMM) (53-57/40 and 53-56/40)
(!!!) (~ 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)
(!!) (~ 6202 Best Value ~) 6202 GE rebranded 6X4WA GE JAN NOS 1970-1980 (7 in stock)
(!) (#1 BEST 6X4WA) JHS-6X4WA Sylvania NOS 1966 (54/40 and 55/40)
