(!!!!!) (BEST SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 55/40) 1% diode balance
(!!!!!) (Good Value Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (55/40 and 56/40) 1-2% balance
(!!!!) (Best Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched (54-54/40 and 54-55/40)
(!!!!) (Good Value Pair) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's 1-2% matched - slightly faded top getters (54-55/40 x 2 tubes)
(!!!) (Best Single) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's (57/40 and 58/40)
(!!!) (BEST VALUE SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's slightly tilted glass (52/40 and 54/40)
(!!!) (BEST VALUE SINGLE) 6X4 SER = LM Ericsson Sweden "D" getter NOS 1950's slightly tilted glass (54/40 and 54/40)
(!!!) (Recommended Single) JTL-6X4W Tungsol NOS 1955 curved "D" getter (49/40 and 52/40)
(!!!) (Recommended Single) JTL-6X4WA Tungsol NOS 1961 curved "D" getter (51/40 and 52/40)
(!!!) (Set of 74) 6X4 US Brands NOS original boxes 1950-1980 era (set of 74)
(!!!) (Single) 6X4 Tungsol NOS 1960's (60/40 and 66/40)
6X4 Arcturus by GE NOS "D" getter 1960 (54/40 and 54/40)
6X4 GE Beckman like new "D" getter 1962 (54/40 and 52/40)
6X4 GE Hewlett Packard NOS "D" getter halo 1962 (55/40 and 56/40)
6X4 GE like new 1950's "D" getter (54/40 and 54/40)
6X4 RCA "O" getter low hours/like new 1960's (49/40 and 52/40)
6X4W GE 1960 "D" getter branded 6X4 Amperex Globe 1971 used/good (50/40 and 50/40)
6X4W GE used/tests like new 1960 era "D" getter (52/40 and 52/40)
6X4WA GE black plates rebranded National NOS (55/40 and 56/40)
6X4WA GE used/tests like new 1960 era no printing (54/40 and 54/40)
