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7581 Tungsol brown base used/75% 1964 (52.5ma)
7581A GE branded RCA used/good 1973 (56ma)
7591A Sylvania branded RCA used/75% 1968 (51ma, Gm=7,600)
75=VT-75 Ken Rad Dual-Diode Triode used/good 1930's (26/19)
75=VT-75 Raytheon NOS 1940's in white box (41/19)
75=VT-75 RCA Dual-Diode Triode NOS 1948 (36/19)
75=VT-75 Sylvania Dual-Diode Triode used/good glass chip inside tube 1930's (26/19)
7C7 US Brands NOS (14 in stock)
7F7 Sylvania round black plates used/good 1960's (1.9/1.7ma)
8020 Amperex 1940's low hours/test like new (4 in stock)
8020 Sperti by RCA 1940's low hours/test like new (1 in stock)
8020 US Brands NOS (6 in stock)
8136 GE NOS (1 in stock)
8136 GE used/good (4 tubes for $9.99)
8136 GE used/good (8 in stock)
8136 RCA NOS
8156 GE NOS (1 pair)
