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(!!!) (Recommended Mullard Pair) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1973 (9.6/8.4ma and 9.0/9.4ma) (Jolida, Fender)
(!!!) (Recommended Mullard Pair) ECC81=12AT7 Mullard UK branded Philips NOS 1970-1976 (10.5/10.0ma and 10.4/9.2ma) (very close Gm) (Jolida, Fender)