(!!!!) (Best Value XF2 Pair) EL34 Mullard XF2 double halo "O-O" used/test like new 1965 (89ma and 90ma)
(!!!!) (Recommended Pair 1965) EL34 Mullard XF2 double halo "O-O" used/tests like new 1965 (85ma and 85.5ma) 1-3% matched
(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)
