6AH4GT Sylvania chrome top NOS 1950's (22ma)
6AH4GT Sylvania rebranded GE low hours/like new 1960's (27ma)
6X5GT FM Co. by GE 1950 used/good (50/40 and 51/40)
6X5GT Ken Rad 1940's used/good (51/40 and 53/40) (RCA construction)
6X5GT Philco by Sylvania used/good 1940's tilted top mica (54/40 and 60/40)
6X5GT RCA branded Raytheon NOS 1950's (51/40 and 52/40)
6X5GT Sylvania chrome top NOS 1958 (51/40 and 52/40)
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)
JAN-CHS-6X5GT Sylvania used/like new 1944 (52/40 and 54/40)
JAN-CRC-6X5GT RCA 1940's used/good (47/40 and 48/40)