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(!!!!!) (Best Single 1971) GZ34 Philips by Mullard Blackburn UK NOS 1971 (58/40 and 58/40)
(!!!!!) (Best Value Pair) GZ34=5AR4 Mullard UK branded RCA NOS 1970 (f32 series) (56-57/40 and 56-58/40)
(!!!!!) (Recommended Single) 5AR4/GZ34 Mullard fat base tests like new 1961 no printing (57/40 and 57/40)
(!!!!) (Best Holland Single) GZ34 Philips Miniwatt Holland NOS double "D" getters 1962 (57/40 and 58/40) (Modwright, Cary, Line Magnetic, Woo)
(!!!!) (BEST SINGLE 1970) GZ34 Mullard Blackburn UK NOS branded RCA 1970 (60/40 and 60/40)
(!!!!) (Best Value Single) 274B Western Electric engraved base used/strong 1930's - broken guide pin (50/40 and 53/40) (best value)
(!!!!) (Best Value Single) GZ34 Philips Miniwatt Holland double "D" getters 1962 low hours/tests like new (58/40 and 58/40) (Modwright, Cary, Line Magnetic, Woo)
(!!!) (Best Single) EZ35=6X5GT Mullard UK NOS 1950-1955 (56/40 and 60/40) (best sound)
(!!!) (Best Single) JAN-6X4WA Sylvania NOS 1978 (56/40 and 56/40)
(!!!) (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) GZ34 Raytheon Japan by Matsushita NOS similar sound and build to Mullard NOS 1970's (60-60/40 x 2 tubes) 1% matched (LS300, Dynaco, Latino, Scott, Marshall, Fender, Cary)
(!!!) (Best Value Pair) NL-866A National USA NOS 1999 (58/40 x 2 tubes)
(!!!) (Best Value Single 1969) GZ34 Mullard UK branded POPE NOS 1969 (58/40 and 60/40)
(!!!) (BEST VALUE) GZ34=5AR4 HH Scott Holland D getters used/strong 1959 (56/40 and 58/40)
(!!!) (READ REVIEW) GZ34 Mullard UK shield logo NOS 1962 (59/40 and 59/40)
(!!!) (Recommended Pair) 866A GE NOS 1971
(!!!) (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)
