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(BEST PAIR) 6C6 Rauland by RCA NOS (57/31 and 58/31)
1603=6C6 (sold out)
6C6 Crosley by Sylvania tests like new 1952 small hairline crack in base (46/31)
6C6 Cunningham Radiotron used/good 1930's (42/31)
6C6 Ken Rad NOS 1947 (60/31)
6C6 Philco NOS 1940's (8 in stock)
6C6 Raytheon used/tests like new 1930's hairline crack in base (2.1ma)
6C6 RCA like new 1953 (2.0ma)
6C6 RCA used/tests like new 1940's (48/31) (2.0ma)
6C6 Sylvania NOS 1950 (48/31)
6C6 Tungsol NOS 1955 (45/31 and 2.1ma)