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(!!!!!) (Recommended Single) 5AR4/GZ34 Mullard UK fat base used/strong 1961 (56/40 and 57/40)
(!!!!) (Best Single #1) GZ34 Siemens Holland NOS 1961 double "D" getters faded printing (58/40 and 58/40) (Matchless, Marshall, Fender, Modwright)
(!!!!) (Best Single #2) GZ34 Siemens Holland NOS 1961 double "D" getters (57/40 and 58/40) (Matchless, Marshall, Fender, Modwright)
(!!!) (BEST PAIR #1) JAN-CAHG-5R4WGA Chatham by Tungsol NOS 1959 (50-56/40 and 51-56/40)
(!!!) (BEST PAIR #2) JAN-CAHG-5R4WGA Chatham by Tungsol NOS 1959 (49-54/40 and 49-55/40)
(!!!) (BEST PAIR) 6X4WA Sylvania NOS 1960's - 1970's (55-55/40 and 54-55/40)
(!!!) (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)
(!!!) (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)
(!!!) (Recommended SINGLE) 5R4GY RCA branded GE NOS 1952 (49/40 and 49/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1954 (58/40 and 60/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (58/40 and 60/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (60/40 and 62/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1957 (60/40 and 63/40)
(!!!) (Recommended Single) 5Z3G RCA NOS 1971 (56/40 and 58/40)
(!!!) (Recommended Single) 866A RCA tests like new 1956 (58/40)
