(!!!!!) (Best Overall Pair) 7N7 Sylvania chrome top NOS 1956-1957 1-3% matched (8/9ma and 8.6/8.4ma) (best 6SN7 sub using adapter sockets)
(!!) (Best Single) 7N7 Sylvania branded Philco NOS parallel black plates 1940's (7.5/7.9ma)
(!!) 7N7 Sylvania branded Philco used/good short bottle parallel gray plates 1948 (7.2/7.6ma)
(!!) 7N7 Sylvania NOS 1960's (8.6/10.2ma)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
(!) (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 (6.6/8.3ma)
(!) (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)
7N7 Philco by Sylvania chrome top "parallel black plates" used/good 1949 (8.4/8.0ma)
7N7 Sylvania branded GE chrome top used/good 1956 (6.0/6.2ma)
7N7 Sylvania branded RCA chrome top used/good 1956 (6.6/8.4ma)
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)
