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(!!!!!) (Best Overall Pair) 5687 GE "5-Star" NOS 1973 (35/34.5ma and 36/34.5ma) 1-3% matched (Audio Note, Manley, Modwright)
(!!!!!) (Best Pair #1) 6L6GC RCA black plate NOS 1976 same date codes (75ma and 76ma)
(!!!!) (Best Overall Pair) 12AX7A RCA gray ribbed plates NOS 1974 same date codes (best tone) (1.3/1.2ma and 1.3/1.1ma) (Fender, McIntosh, Rogue Audio
(!!!!!) (Best Overall Pair) GL-6072 GE 5 star triple mica black plates "D" getter halo like new 1954-1955 (2.9/2.9ma and 2.9/3.1ma) (same Gm) (AKG, Tele 251, Peluso, Rode)
(!!!!) (Best Pair #3) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.0/8.6ma and 8.8/9.0ma) 1-3% matched
