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(!!!!) (Best Pair #1) ECC81=12AT7 Mullard UK copper grid posts NOS 1962-1963 (10.8/11.4ma and 11.8/12.4ma) 1-5% matched (sweet sound)
(!!!!) (Best Pair #3) ECC81=12AT7 Mullard UK NOS 1968-1970 (9.4/11.2ma and 9.8/11.2ma) 1-3% matched (sweet sound)
(!!!!) (Recommended Pair) ECC81=12AT7 Philips by Mullard NOS 1966-1970 (10/9.2ma and 9.3/8.6ma) (Close Gm matching) 1-5% matched
(!!!) (Best Pair #2) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1976 (10.5/10.0ma and 10.4/9.2ma) (very close Gm) (Jolida, Fender)
(!!!) (Best Pair #3) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1973 (9.6/8.4ma and 9.0/9.4ma) (Jolida, Fender)
