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(!!!) (Best Pair) EC92=6AB4 Siemens Halske Germany branded Mullard NOS 1964 (10.2ma and 10.6ma)
7F7 Sylvania parallel round black plates 1940's no printing (2.0/1.9ma)
7F7 Sylvania branded GE staggered round black plates 1958 used/good (2.1/2.3ma)
7F7=VT-189 Sylvania rebranded GE round black plates used/like new 1943 (3.0/3.4ma)
12SQ7GT Emerson by RCA used/good 1940's (90/60)
13EM7 Westinghouse Canada NOS same build as RCA 1970 (1.3/38ma)
(!!!!!) (Best Overall Single) 12AU7=ECC82 Mullard BVA UK NOS 1972 (11.8/12.0ma) (Same Gm) 1-2% section balance
1299=3D6 NOS Sylvania NOS 1953 (104/52)
1299=3D6 Sylvania used/good 1940's dirt over printing (80/52)
1299=3D6 Sylvania used/strong 1940's (100/52)
1299=3D6 Sylvania used/strong 1940's (90/52)
12A4 GE used/good 1950's (1 in stock)
12A4 US Brands NOS (0 in stock)
12AC6 NOS
12AD6 US Brands NOS (6 in stock)
12AD7
12AE6A Raytheon NOS 1960's (2 in stock)
12AE6A Tungsol NOS 1950's (single)
12AE7 NOS (3 in stock)
12AF6 US Brands NOS (8 in stock)
