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(!!!!) (Best Single) 12AX7A Sylvania red print NOS 1960's (Gm=3000/3500 and 2.5/2.9ma)
(!!!!) (BEST SINGLE) 201-A Silvertone Balloon NOS 1930 era (3.8ma and Gm=750)
(!!!!) (Best Single) 5842=417A Amperex "PQ" Holland "D" getter Gold Pins NOS 1956-1959 (35ma)
(!!!!) (Best Single) 5965A GE NOS 1976 (16.8/17.0ma) 1-2% section balance
(!!!!) (BEST SINGLE) 5U4GB Raytheon "O" getter NOS 1962 (58/40 and 60/40)
(!!!!) (Best Single) 5V4G Ken Rad black plates NOS 1945 (60/40 and 60/40)
(!!!!) (Best Single) 6146B GE NOS 1980 (121ma)
(!!!!) (BEST SINGLE) 6201=12AT7WC GE "5 STAR" NOS double mica, copper grid posts, gray plates, 1972 (9.8/10.5ma)
(!!!!) (Best Single) 6550 Tungsol branded RCA NOS vented plate NOS 1965 (130ma) (Recommended for Audio Research Ref power supply)
(!!!!) (BEST SINGLE) 6DJ8 Philips by Matshushita JAPAN NOS 1960's (14.5/15.4ma)
(!!!!) (Best Single) 6L6GC RCA black plate NOS 1962 (88ma)
(!!!!) (Best Single) 6SN7GTA GE NOS "U" getter halo - side getter - copper grid posts 1952 (9.3/11ma)
(!!!!) (Best Single) 6V6GTA RCA NOS 1969 (47.8ma)
(!!!!) (Best Single) 6V6GTA Sylvania NOS 1960 era (42ma)
(!!!!) (Best Single) 8068 GE NOS 1983 slightly tilted glass (47.5ma)
(!!!!) (Best Single) 83 RCA Radiotron NOS 1940's (60-59/40)
(!!!!) (Best Single) CV4003=12AU7=6189 Mullard UK NOS 1978 rebranded "6189 RTC" 1981 (9.6/10.8mA)
(!!!!) (Best Single) CX-345 Cunningham Balloon used/tests like new 1930 era (41ma)
(!!!!) (BEST SINGLE) E188CC=7308 Philips Miniwatt SQ Holland NOS 1963 (17.0/16.6ma)
(!!!!) (Best Single) ECC189=6ES8 Amperex Globe Logo Holland NOS 1969 (17.8/17.2ma)
