(!!!!!) (Recommended Single) GZ34 Pope Holland metal base NOS 1956 (57/40 and 60/40)
(!!!!) (Best Value Single) GZ34=5AR4 Philips Mullard NOS 1979 (57/40 and 58/40)
(!!!) (BEST 6X4 MULLARD) EZ90=6X4 Mullard rebranded Amperex "D" getter 1960 (57/40 and 57/40)
(!!!) (BEST 6X4 MULLARD) EZ90=6X4 Mullard rebranded Amperex "D" getter 1960 (60/40 and 60/40)
(!!!) (Best Pair 1957) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (59-60/40 and 60-60/40)
(!!!) (BEST SINGLE) 866A RCA tests like new 1958 (66/40)
(!!!) (Best Value Pair) 866A RCA like new 1956 in white boxes (57-58/40 x 2 tubes)
(!!!) (Best Value Pair) 866A RCA like new 1956 in white boxes (60-60/40 x 2 tubes)
(!!!) (Best Value Pair) NL-866A National USA NOS 1999 (58/40 x 2 tubes)
(!!!) (Best Value) GZ34=5AR4 Philips Mullard used/tests like new 1970's (60/40 and 63/40)
(!!!) (Best Value) JAN-6X4WA Sylvania NOS 1972-1979 (1 in stock)
(!!!) (READ REVIEW) GZ34 Mullard UK shield logo NOS 1962 (59/40 and 59/40)
(!!!) (Recommended Pair 1957) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (56-59/40 and 57-60/40)
(!!!) (Recommended Pair 1957) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (57-61/40 and 57-62/40)
(!!!) (Recommended PAIR) 314A Western Electric Engraved base NOS 1930's (58-65/40 and 60-65/40)
(!!!) (Recommended PAIR) 314A Western Electric Engraved base NOS 1930's (58/40 and 64/40 x 2 tubes)
(!!!) (Recommended Pair) 866A GE NOS 1971
(!!!) (Recommended Single) 5Z3G RCA NOS 1954 (58/40 and 60/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (57/40 and 58/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1971 (56/40 and 58/40)
