6N7 Sylvania NOS 1940's (2.3/2.3ma)
6N7 Westinghouse Canada NOS 1950's (2.6/3.0ma)
6N7=VT-96 RCA used/test like new mid-1940's (3.1/3.2ma) 1-2% section balance
6N7=VT-96 RCA used/test like new mid-1940's (3.5/3.8ma)
6P5GT Westinghouse NOS 1960 era (62/36)
6R8 Raytheon NOS 1950-1951 (4 in stock)
6S4A RCA branded Sylvania black plate NOS 1960 era (20.6ma)
6SL7GT Brimar NOS black base black plates 1950's (2.2/2.4ma) (slightly microphonic)
6U5 RCA like new 1970 (bright green eye)
6U5 Sylvania 1940's used/good medium brightness
6U5 Sylvania Tuning Eye NOS 1940's (4 in stock)
6U5 Sylvania Tuning Eye NOS 1940's (bright eye)
6U5 Tungsol Tuning Eye NOS 1949 (bright eye)
6V6GT Ediswan UK NOS no printing (41ma)
6V6GT GE black round plate used/good 1953 hairline crack in base (35ma)
6V6GT Tungsol black plate used/good 1950's (38ma)
6X4W GE 1960 "D" getter branded 6X4 Amperex Globe 1971 used/good (50/40 and 50/40)
6X4WA GE black plates rebranded National NOS (55/40 and 56/40)
6X5GT GE used/good 1951 (49/40 and 50/40)
6X5GT GE used/good 1958 (48/40 and 50/40)
