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(!!) (#1 12AU7 Raytheon from 1954) 12AU7 Raytheon gray ribbed plates "D" getter halo NOS 1954 (10.6/11.2ma)
(!!) (#1 12AU7 Raytheon from 1956) 12AU7 Raytheon gray ribbed plates super large "U" getter halo NOS 1956 (10.4/10.8ma) (High Ma and Gm)
(!!) (#1 12AU7A Raytheon 1960's single) 12AU7A Raytheon Uniline gray ribbed plates "O" getter NOS 1960's (8.2/11ma)
(!) (Single) 5963=12AU7 GE NOS 1960's (11.6/11.8ma)
(!!) (Single) 5963=12AU7 GE NOS 1981 (9.4/11.4ma)
(!!) (Nice Single) 5963=12AU7 RCA NOS 1961 (10.2/9.4ma)
(!!) (1 Pair) CV4069=13D3 Brimar UK NOS 1969 era with flying leads (no pins) (matched on TV-7D/U)
(!!!!) (SINGLE) 12AU7A GE NOS 1963 copper grid posts (8.9/10.2ma)
(!!) (Best Single) USN-CHS-5963=12AU7 Sylvania NOS "D" getter 1959 (10.6/11.8ma)
(!!) (Best Value Pair) 12AU7A RCA MEXICO NOS "TOP GETTER" original boxes 1970's (9.2/10ma and 8.7/9.4ma)
(!!) (BEST VALUE SINGLE) 12AU7A RCA clear top used/good 1960's (8.0/9.4ma)
(!!) (Good Value Single) 12AU7 Amperex "Hewlett Packard" Holland "o" getter halo used/good 1968 (8.2/8.4ma)
(!!) (Recommended Single) 5814A=12AU7 Hyperlec Brive France (Holland clone) NOS 1970's rebranded National (11.8/12.2ma)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
5963 RCA black ribbed plates" and D getter halo NOS 1957 (sold out - read review)
(!!!) (Best Value Single 1958) 12AU7=ECC82 Brimar made for Arkay England ribbed plates 1958 (8.2/10.8ma)
(!) 6189=12AU7A GE NOS 1975 (9.6/10ma) 1-2% section balance
(!!) 12AU7A RCA CANADA NOS "D" getter halo 1950's tip is chipped (10.0/10.4ma)
(!!) 12AU7A RCA clear top used/good 1960's (7.4/8.6ma)
(!!) 12AU7A RCA clear top used/good 1964 (8.2/8.6ma)
