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(!!!!!) (Best Mullard 1962) 12AX7=ECC83 Mullard UK BVA ribbed plates NOS copper grid posts 1962 (1.1/1.1ma) (same Gm) 1% section balance
(!!!!!) (Best Overall Single) 12AU7=ECC82 Mullard BVA UK NOS 1972 (11.8/12.0ma) (Same Gm) 1-2% section balance
(!!!!!) (Best Value Pair) ECC83=12AX7 Philips Miniwatt Holland used/tests like new 1968-1970 (1.2/1.3ma and 1.4/1.1ma) 1-3% matched
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK branded Philips ribbed plates NOS 1965 (1.0/0.9ma) (163 series)
(!!!!!) (Single 1956) CV491=12AU7 Mullard UK "long plates" with "D" getter 1956 like new a few scratches on the glass (10.2ma and 8.2ma) (smooth rich textured sound) (rare)
(!!!!) (Best Single 1956) ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and large/wide "U" getter branded Haltron 1956 (10/9.2ma) (k62 series) (High Gm) (rare)
(!!!!) (Slightly microphonic) ECC83=12AX7 Amperex Bugle Boy Holland "long plates" and "D" getter tests like new 1958 (1.2/1.3ma and Gm=1700/1700) 1-3% section balance
(READ REVIEW) 12AU7=ECC82 RT Radio Technique France long plates 1958-1959 (11.6/9.8ma) (close Gm)
ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and "O" getter NOS 1958 (10.4/11.8ma)
ECC83=12AX7 Mullard UK BVA long plates "O" getter like new 1958 (f91 series) (1.2/1.2ma)
