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(!!!!) (Highest Testing Pair) 71A Philco and Aristocrat test like new 1930's similar build (32.2ma and 32.5ma) 1-3% matched
(!!!!) (Pair) 6J5GT Sylvania lightning logo NOS 1945-1946 (7.6ma and 7.4ma)
(!!!!) (READ REVIEW) GB-5931 Sylvania brown base gold brand 1960's (60/40 and 65/40)
(!!!!) (Recommended Pair) 71A Westinghouse Canada NOS 1949 in white boxes (23ma and 27.3ma)
(!!!!) (Recommended Pair) 7N7 Sylvania branded GE chrome top NOS 1954-1956 (7.4/7.0ma and 7.4/7.2ma) 1-2% matched
(!!!!) (Recommended Pair) 8417 Sylvania branded RCA NOS 1972-1973 (119.2ma and 123.7ma)
(!!!!) (Recommended Pair) JAN-12AT7WC Philips by Sylvania black plates NOS 1981-1982 (8.3/8.4ma and 8.4/7.8ma)
(!!!!) (Recommended Pair) JAN-CRC-30 RCA NOS 1940's same build (2.9ma and 3.0ma)
(!!!!) (Recommended Single 1957) 12AU7A Zenith Sylvania D getter NOS 1957 (13.0/13.2ma)
(!!!!) (Single 1958) 5751 Sylvania black plates triple mica D getter halo 1958 used/good (2.7/2.3ma)
(!!!!) (Single) 12BH7A GE gray oval plates 1962 (6.6/9.6ma)
(!!!!) (Single) 12BH7A Sylvania gray oval plates "O" getter NOS 1960 era (10.4/7.6ma)
(!!!!) (Single) 12BH7A Sylvania Silvertone gray oval plates large "O" getter halo 1960 era NOS (11.5/10.6ma)
(!!!!) (Single) JAN-6189W=12AU7 Philips by Sylvania NOS 1987 (8.2/8.8ma)
(!!!!) (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)
(!!!!) 56 Arcturus Blue Balloon engraved base tests like new 1930's (5.0ma)
(!!!) (#1 56 National Union Pair) 56 National Union rebranded Western Electronics NOS 1940's (5.0ma and 5.2ma)
(!!!) (#1 6BX7GT RCA single) 6BX7GT RCA NOS 1961 (41/48ma)
(!!!) (Best Overall Pair) 12DQ6B Philco by Sylvania NOS 1960's (81ma and 82ma) 1-3% matched
