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(!!!) (Best Single) ECH81=6AJ8 Mullard Holland NOS 1962 (6.8ma and 13.5ma)
ECH81=6AJ8 Tungsram Hungary branded Telefunken tests like new 1970's (6.5ma and 10.6ma) (strong Gm)
ECH81=6AJ8 Valvo Germany like new 1960 (6.3ma and 10.6ma)