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(!!) (Best Value Single 1953) 12AU7 Sylvania black plates "D" getter used/strong 1953 no printing (9.6/11.8ma)
(!!) (Recommended Single) 5Y3GT Hytron NOS 1951 (56/40 and 60/40)
(!!) (Single) 403B=6AK5 Western Electric NOS "D" getter 1969 (5.3ma)
(!!) (slightly microphonic) 12AU7A Raytheon black ribbed plates "D" getter halo black coated glass 1951 (8.8/9.6ma)
(!!) (slightly microphonic) 6SL7GT RCA NOS 1950 (2.2/2.3ma) 1-2% section balance
(!!) 403B=6AK5 Western Electric NOS "O" getter 1980 in 1979 box (5.8ma)
(!!) 6SN7GTB Tungsol black plates tall bottle "U" getter used/75% 1950's (6.2/6.0ma)
(!!) 6V6GT Philco by Sylvania tests like new 1957 (42.2ma)
(!) (Best Sylvania) 6K6GT Sylvania chrome top NOS 1956 (41.2ma)
(!) (SINGLE) CK-5755=420A Raytheon clear top NOS 1960's (1.4/1.3ma)
(!) (SINGLE) JAN-CRP-5755=420A Raytheon clear top NOS 1965 (1.3/1.5ma)
(!) (slightly microphonic) JAN-CRC-6SL7GT RCA NOS black plates 1951 tilted glass (2.0/2.2ma)
(!) 6F6G Sylvania coated glass used/good 1940's (36.8ma)
(!) 6F6GT GE Coronado NOS 1956 (36.8ma)
(slightly microphonic) 6SN7GT Hytron NOS 1948 (7/8ma)
(slightly microphonic) 6SN7GTA GE NOS 1952 copper grid posts (7.4/10ma)
2.5.26 (!!) 6AK5 Western Electric NOS "D" getter 1956 (7ma)
43 National Union NOS 1950 era (75/58)
43 Sylvania NOS 1947 (71/58)
6B4G Raytheon NOS 1950 era (94ma)
