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(!!!!!) (Best Pair) 12AX7=ECC83 Pope and Philips Holland NOS 1971-1972 (1.1/1.6ma and 1.2/1.7ma) (Same Gm)
(!!!!!) (Best Single 1966) ECC83=12AX7 Mullard UK ribbed plates NOS 1966 (163 series) (1.3/1.1ma) (same Gm) (sweet sound)
(!!!!!) (Best Single 1967) ECC83=12AX7 Mullard UK ribbed plates NOS 1967 (163 series) (1.4/1.2ma) (same Gm) (sweet sound)
