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(!!!!) (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)
(!!!!) (Best Single 1957) ECC83=12AX7 Mullard UK long plates "D" getter NOS 1957 (mC1 series) (1.1/1.3ma) (rare)
(!!!!) (Recommended Single 1959) 12AU7 Mullard Heath UK long plates "O" getter used/good 1959 (8.8/9.0ma)
(!!!!) (Single) ECC83=12AX7 Philips Holland low hours/like new 1971 (1.1/1.1ma and Gm=1700/1600)
(!!!) (Recommended Single) 12AX7 Amperex Holland "Long Plates" with "D" getter used/tests like new good 1958 faded printing (Gm=1700/1600 and 1.4/1.2ma)
(!!!) (Single 1959) 12AX7 Amperex Bugle Boy Holland large O" getter halo used/good 1959 (Gm=1500/1300 and 1.0/0.7ma) (161 series)
(!!!) (Single 1965) 12AX7=ECC83 Siemens Germany ribbed plates used/good (0.9/0.8ma and Gm=1500/1400)
(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)
