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)
6SN7GTB Raytheon black plates like new 1960 era (7.3/7.4ma) 1-3% section balance
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)
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)
6X5GT GE used/good 1960 (47/40 and 48/40)
6X5GT GE used/good 1963 (48/40 and 49/40)
6X5GT Ken Rad 1940's used/good (51/40 and 53/40) (RCA construction)
6X5GT Philco by Sylvania used/good 1940's tilted top mica (54/40 and 60/40)
6X5GT RCA branded Raytheon NOS 1950's (51/40 and 52/40)
6X5GT RCA NOS 1950's (46/40 and 51/40)
