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(!!!) (BEST 6X4 MULLARD) CV493=EZ90=6X4 Mullard UK NOS D getter 1955 in white box (60/40 and 60/40) 1% section balance
(!!!) (BEST HOLLAND) EZ90=6X4 Philips Holland low hours "D" getter 1958 (50/40 and 50/40) 1% section balance
(!!!) (BEST PAIR) JAN-6X4WA Sylvania NOS 1967 (54-56/40 and 54-58/40)
(!!!) (HOLLAND) CV493=6X4 Philips Holland low hours "D" getter 1956 (49/40 and 48/40)
(!!!) (Single) GB-6X4WA Sylvania Gold Brand NOS "D" getter 1960 era (57/40 and 57/40)
(!!!) FAA-6X4WA Sylvania NOS 1965 (55/40 and 57/40)
(!) JHS-6X4W Sylvania NOS 1961 (54/40 and 55/40)
6X4 Allied by Matsushita Japan NOS 1960's (58/40 and 58/40) 1% section balance
6X4 International by Matsushita Japan NOS 1960's (55/40 and 56/40)
FAA-6X4WA Sylvania NOS 1962 (54/40 and 55/40)
JAN-6X4WA Sylvania NOS 1979 (52/40 and 58/40)
