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)
