(!!) (Best Single) 7N7 Sylvania branded Philco NOS parallel black plates 1940's (7.5/7.9ma)
(!) (Good Single) 7N7 Sylvania branded GE NOS 1961-1962 (7.5/8.3ma)
(!) (SINGLE) 7N7 Sylvania TALL BOTTLE branded Hytron parallel black plates chrome top NOS 1952 - small chip/blemish at top of tube (7.6/7.8ma)
(!!!!) (Recommended Pair) 7N7 Sylvania branded GE chrome top NOS 1954-1956 (7.4/7.0ma and 7.4/7.2ma) 1-2% matched
(!!) 7N7 Sylvania NOS 1960's (8.6/10.2ma)
7N7 Sylvania branded RCA chrome top used/good 1956 (6.6/8.4ma)
(!!!!!) (Best Pair 1950's) 7N7 Sylvania chrome top NOS 1956-1957 1-3% matched (8/9ma and 8.6/8.4ma) (best 6SN7 sub using adapter sockets)
(!!!!) (Best Pair #2) 7N7 Sylvania branded RCA and Sylvania NOS 1960-1963 (9.4/9.0ma and 9.6/9.8ma) (High Gm) 1-5% matched
7N7 Sylvania chrome top branded GE low hours/tests like new 1957 (7.4/11.4ma)
(!!!) (Recommended Pair) 7N7 Sylvania NOS branded GE and RCA 1960-1965 (9.4/8.0ma and 8.0/8.4ma) (close Gm)
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
