6A3 RCA Victor NOS 1948-1949 (62ma)
6A3 Sylvania branded RCA used/good 1940's (54.2ma)
6A3 Sylvania branded Tungsol used/good 1940's (70ma)
6A3 Tungsol coated glass used/good 1940's (44ma)
6A3 Tungsol coated glass used/good 1940's (60ma)
6AC5GT Sylvania NOS 1940's (39/21)
6AC7 Ken Rad NOS 1940's (14ma)
6B4G Ken Rad branded RCA coated glass NOS 1946 (110ma)
6B4G Philco by Sylvania NOS 1947 (80ma)
6B4G Sylvania used/like new 1940's (96ma)
6C5 Ken Rad metal used/good 1940's (6.5ma)
6C5 Philco metal used/good 1952 (8.2ma)
6C5 RCA metal used/very good 1964 (7.7ma)
6C5 RCA NOS 1951 (7.7ma)
6C5 Wards Airline by GE used/tests like new 1946 (9.0ma)
6C8G CBS NOS 1950's (like RCA) (3.7/4.1ma)
6C8G National Union NOS 1950 era (3.6/5.8ma)
6C8G=VT-163 Tungsol round black plates like new 1940's (3.1/3.2ma) 1-2% section balance
6D6 Ken Rad NOS 1940's hairline crack in base
6F6 GE metal can NOS 1952 (38ma)
