(!!!!!) (BEST Pair) ECC81=12AT7 Mullard UK NOS 1970-1973 (9.0/9.2ma and 8.8/9.8ma)
(!!!!) (Best Overall Single) EZ81 Mullard Blackburn UK NOS branded Realistic Lifetime gold pins 1966 (56/40 and 57/40)
(!!!) (Best Value Single) ECC85=6AQ8 Philips Holland NOS 1975 (10/17ma)
(!!!) (Good Value Pair) ECC81=12AT7 IEC Mullard used/good 1967 (6.8/7.0ma and 7.0/7.2ma) (Jolida, Fender)
(!!!) (Recommended Single) 12AT7=ECC81 Mullard branded Raytheon NOS 1972 (11/13.2ma)
(!!!) (Recommended Single) ECC85=6AQ8 Philips Holland NOS 1970's (11.6/14.2ma)
(!!!) (Recommended Single) ECC85=6AQ8 Philips Holland NOS 1970's (13.5/14.4ma)