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(!!!!!) (Single) GZ34 Amperex Bugle Boy by Mullard used/tests like new 1962 faded printing some vertical scratches on base (60/40 and 62/40)
(!!!!) (Best GZ34 for the money) GZ34 Toshiba Japan NOS 1970's (59/40 and 59/40)
(!!!!) (Best Single #2) GZ34 Siemens Holland NOS 1961 double "D" getters (57/40 and 58/40) (Matchless, Marshall, Fender, Modwright)
(!!!!) (Best Single) 5AS4=5U4G Premium GE NOS 1957 (57/40 and 58/40) (higher max plate current)
(!!!) (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 #1) JAN-CAHG-5R4WGA Chatham by Tungsol NOS 1959 (49-56/40 and 49-55/40)
(!!!) (BEST PAIR #1) JAN-CAHG-5R4WGA Chatham by Tungsol NOS 1959 (50-57/40 and 50-57/40)
(!!!) (BEST PAIR #2) JAN-CAHG-5R4WGA Chatham by Tungsol NOS 1959 (48-54/40 and 48-55/40)
(!!!) (Best Pair) GZ34 Toshiba Japan NOS 1970's no printing (rare) (60-60/40 x 2 tubes) 1% matched (LS300, Dynaco, Latino, Scott, Marshall, Fender, Cary)
(!!!) (BEST PAIR) JAN-6X4WA Sylvania NOS 1967 (54-56/40 and 54-58/40)
(!!!) (Best Value Pair) 5Z3G RCA NOS 1957 in gold colored boxes slightly tilted glass (56-59/40 and 57-60/40)
(!!!) (Best Value Pair) 866A RCA like new 1956-1959 in white boxes (60-62/40 x 2 tubes)
(!!!) (Best Value Pair) NL-866A National USA NOS 1999 (58/40 x 2 tubes)
(!!!) (Best Value) 5R4GY RCA NOS 1953 small chip off bottom edge of base (50/40 and 51/40)
(!!!) (HOLLAND) CV493=6X4 Philips Holland low hours "D" getter 1956 (49/40 and 48/40)
(!!!) (Holland) GZ34=5AR4 Holland used/strong 1961 no printing (58/40 and 58/40) 1% section balance (f33 series)
(!!!) (READ REVIEW) GZ34 Mullard UK shield logo NOS 1962 (59/40 and 59/40)
(!!!) (Recommended Pair) 866A GE NOS 1971 (54/60 and 54/60)
(!!!) (Recommended Pair) 866A GE NOS 1971 graphite lifted off top plate (56/40 and 57/40)
