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0C3 RCA NOS 1951 argon
0C3 RCA NOS 1974 argon
0C3 RCA used/good 1940's (argon)
0C3 RCA used/test like new 1951 (1 Pair)
0C3=VR105 RCA used/good 1940's
0C3=VR105 RCA used/good 1948 (argon)
0D3 Hytron branded Electronic Enterprises NOS 1950 era (argon)
0D3 RCA used/good 1950 (argon)
0D3 RCA used/good 1954 (argon)
0D3 Sylvania NOS 1940's (argon)
0D3 Westinghouse NOS 1940's reprinted in 1975 (argon)
5R4GYA GE NOS 1959 in white box (52/40 and 50/40)
5R4GYB RCA brown base like new 1970's part of glass partially melted into bottom mica (48/40 and 49/40)
5R4GYB RCA brown base NOS 1970's part of glass melted into bottom mica (50/40 and 53/40)
5R4GYB RCA NOS 1970 (53/40 and 52/40)
5R4GYB RCA NOS 1970 slightly tilted glass (52/40 and 53/40)
5R4GYB RCA used/strong 1970 (52/40 and 54/40)
5R4GYB RCA used/very good 1964 (51/40 and 54/40)
EL83 Tesla like new 1971 (64ma)
