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(!!!!!) (Best Pair #1) ECC83=12AX7 Mullard UK branded Philips ribbed plates NOS 1964-1969 (163 series) (1.5/1.4ma and 1.3/1.4ma) (sweet sound) (Close Gm)
(!!!!!) (Best Pair #2) ECC83=12AX7 Mullard UK branded Philips ribbed plates NOS 1964 (163 series) (1.0/1.2ma and 1.4/1.1ma) (sweet sound) (Close Gm)
(!!!!!) (Best Single) ECC83=12AX7 Mullard UK branded Philips NOS 1967 (163 series) (1.2/1.3ma) (sweet sound) (Same Gm)
(!!!!!) (Best Value Single) ECC83=12AX7 Mullard UK low hours/like new 1967 (163 series) (1.4/1.2ma) (sweet sound)
(!!) (Best Value Single) 12AX7=ECC83 Mullard UK used/good 1965 (163 series) (Gm=1500/1400 and 1.0/0.8ma)
