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(!!!!) (Single) ECC82=12AU7 Philips Holland NOS 1969 (11.8/11.4ma) (Same Gm) 1-3% section balance
(!!!!) (Single) ECC82=12AU7 Philips Miniwatt Holland NOS "O" getter 1965 (11.5/12.0ma) (High mA and Gm)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.2/9.8ma)
(!!!!) (Slightlly microphonic single) JAN-CHS-12AU7 Sylvania "black plates" with "D" getter halo NOS 1951 (9.8/10ma)
(!!!!) (slightly microphonic single) ECC82=12AU7 Telefunken Diamond Bottom smooth plates NOS 1961 (10.0/10.8ma) (high Gm)
(!!!) (Best Pair 1961) ECC82=12AU7 Miniwatt Holland NOS and like new 1961-1963 (9.8/9.2ma and 9.4/9.8ma)
(!!!) (Best Single 1967) ECC82=12AU7 Philips Holland NOS 1967 (11.2/10.6ma) (same Gm)
(!!!) (Best Single) 12AU7A RCA clear top NOS 1964 (8.4/8.6ma) (same Gm)
(!!!) (Best Single) 12AU7A Tungsol tall ribbed plates NOS "O" getter halo 1960 era (10.8/11.4ma)
(!!!) (Best Value Single 1958) 12AU7=ECC82 Brimar made for Arkay England ribbed plates 1958 (8.2/10.8ma)
(!!!) (Best Value Single) 12AU7=ECC82 Telefunken smooth plates like new 1963 (10/8.4ma)
(!!!) (Best Value Single) CV4003=12AU7 RFT East Germany NOS 1974 (12.2/12.8ma)
(!!!) (Best Value Single) CV4003=M8136=12AU7 Mullard UK NOS large "O" getter halo 1962 dirt was over entire tube (10.6/11.0ma)
(!!!) (Best Value Single) ECC82=12AU7 Philips Holland branded SONOTONE NOS 1960 (10.0/9.2ma)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (7.5/9.6ma and 7.5/9.2ma)
(!!!) (Good Value Single) 12AU7 EICO Holland used/good 1961 (8.0/9.6ma)
(!!!) (Good Value Single) 12AU7 Philips Australia NOS 1970 era (9.6/8.8ma) (same internals as Holland made)
(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (8.3/9.0ma)
(!!!) (Recommended Single 1957) 12AU7A Sylvania gray pinched plates "D" getter halo NOS 1957 (9.2/10.2ma)
(!!!) (Recommended Single) 12AU7A RCA clear top NOS 1960 era (9.6/9.8ma) (Same Gm)
