(!!!) (Best Value XF2) EL34 Mullard branded GE XF2 double halo "O-O" 1966 guide pin broke off (102.5ma)
(Best Value Pair) EL34 Mullard UK used/good XF2 single halo 1971 (74ma and 78ma)
(Good Value Pair) EL34 Mullard UK XF2 single halo used/good 1969-1972 (83.6ma and 85.6ma)