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(!!!!!) (BEST PAIR 1961) 12AU7=ECC82 Mullard UK ribbed plates NOS 1961 same date codes (9.0/8.8ma and 9.3/9.2ma) (same Gm) 1-3% matched
(!!!!!) (BEST PAIR 1963) 12AU7=ECC82 Mullard UK ribbed plates NOS 1963 same date codes (9.5/8.6ma and 9.0/8.6ma) (close Gm) 1-3% matched
(!!!!!) (PAIR 1961-1962) 12AU7=ECC82 Mullard BVA UK ribbed plates NOS 1961-1962 (10/8.6ma and 10/8.8ma) (close Gm) 1-3% matched
(!!!!) (Best Single #1) 12AU7=ECC82 Mullard UK shield logo NOS 1963 (10.2/11.0ma) (smooth rich sound)
(!!!!) (Best Single #2) 12AU7=ECC82 Mullard UK shield logo NOS 1965 (11.2/12.6ma) (smooth rich sound) (Copy)
(!!!!) (Best Value Single) 12AU7=ECC82 Mullard UK ribbed plates like new 1965 (10/12.8ma) (smooth rich sound)
(!!!!) (Recommended Pair) 12AU7A=ECC82 Mullard rebranded "GE" and "Zenith" ribbed plates NOS 1966 (9.8/11ma and 10.4/10.5ma) (smooth rich sound)
(!!!!) (Single 1953) 12AU7 GE gray ribbed plates "U" getter NOS/80% 1953 (7.6/8.0ma) (smooth sound)
(!!!!) (Single 1961) 12AU7=ECC82 Mullard BVA UK shield logo NOS 1961 (7.5/9ma) (Gf1 series) (smooth rich sound)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
