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(!!!!!) (Best GZ34) GZ34 Teonex by Mullard UK fat brown base 1959 (58/40 and 58/40) (f31 series) (similar to metal base)
(!!!!!) (Best Overall Pair) EL34 Mullard UK XF1 NOS 1959-1961 double "O-O" getter halos (83ma and 80ma) (1st version after metal base) (very rare)
(!!!!!) (Best Value 1961) GZ34 Mullard UK shield logo fat base 1961 low hours/like new (53/40 and 55/40) (f31 series)
(!!!!!) (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)
