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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)