(!!) (Recommended Mullard Pair) EL36 Mullard branded International NOS 1969 (82ma and 88ma)
(!) (Recommended Mullard Pair) EL36 Mullard Blackburn UK NOS 1963 - 1968 (93ma and 87ma)
(!) (Recommended Pair) EL36 Haltron Japan clear top NOS 1960's (86ma and 93ma)