(!!!) (Recommended Single) 7N7 Sylvania TALL BOTTLE branded GE parallel gray plates chrome top NOS 1952 (9.5/11.8ma)
(!!) (Best Single) 7N7 Sylvania branded Philco parallel black plates 1940's (7.5/7.9ma)
(!) 7N7 Sylvania branded GE NOS 1961-1962 (7.5/8.3ma)
(!!!!!) (Best Pair) 7N7 Sylvania branded GE and RCA chrome top NOS 1955-1956 same build (8.4/8.4ma and 7.9/8.3ma) (same Gm)
7N7 Philco by Sylvania chrome top "parallel black plates" used/good 1949 (8.4/8.0ma)
7N7 Sylvania chrome top branded GE low hours/tests like new 1957 (7.4/11.4ma)
7N7 Sylvania chrome top used/good 1956 (6.5/7.0ma)
(!!) 7N7 Sylvania branded Philco short bottle parallel gray plates 1948 (7.2/7.6ma)
7N7 Sylvania branded GE chrome top used/good 1956 (6.0/6.2ma)
