(!!) (~ Recommended Single ~) 12SN7GT Sylvania Honeywell chrome top gray plates NOS 1957 white mark on base (9.4/10.8ma)
(!!) 12SN7GT RCA Honeywell black plates used/good 1957 (7.6/8.4ma)
12SN7GT CBS Hytron branded Motorola 1955, small crack in pin #1 that was resoldered (7.6/7.8ma)
12SN7GT Philco by Sylvania chrome top NOS 1956 (8.5/9.0ma) (high Ma and Gm)
12SN7GT RCA coated glass NOS 1950 (7.6/8.6ma)
12SN7GT Sylvania NOS 1960 (7.5/8.0ma)
12SN7GTA RCA NOS 1960's (10/11ma)
12SX7GT RCA NOS 1955 (9.6/12.4ma)
