(!!!!!) (Best Single) EL34 Mullard UK XF1 NOS 1959 double "O-O" getter halos (83ma) (1st version after metal base) (very rare)
(!!!!) (Good Value XF2 Pair) EL34 Mullard UK XF2 double round "O-O" getter halo used/good 1965-1967 (72ma and 76.5ma)
(!!!!) (Recommended Pair) EL34 Mullard branded Siemens and RCA XF2 single "O" getter halos NOS 1969-1972 (78ma and 81.5ma)
(!!!!) (Single 1965) EL34 Philips Miniwatt by Mullard XF2 double round getter halo "O-O" NOS 1965 (76ma)
