(!!) (~ Recommended Single ~) 12SN7GT Sylvania Honeywell chrome top gray plates NOS 1957 white mark on base (9.4/10.8ma)
(!!) 12SN7GT RCA Honeywell black plates NOS 2 glass chips at bottom of tube 1957 (9.09.2ma)
(!!) 12SN7GT RCA Honeywell black plates used/good 1957 (7.6/8.4ma)
(!!) 12SN7GT Sylvania chrome top black plates NOS 1954 (9.5/12ma)
(!!) 12SN7GTA GE branded RCA coin-base NOS 1970's (9.2/9.4ma)
12SN7GT RCA coated glass NOS 1950 (7.6/8.6ma)
12SN7GT Sylvania chrome top used/tests like new 1955 (8.2/8.6ma)
12SN7GT Sylvania NOS 1960 (7.5/8.0ma)
12SN7GTA GE Amperex side getter NOS 1970 (8.0/8.6ma)
12SN7GTA GE side getter NOS 1956 (7.0/7.2ma)
12SN7GTA GE side getter NOS 1970's (9.2/11ma)
12SN7GTA RCA NOS 1960's (10/11ma)
12SX7GT RCA NOS 1955 (9.6/12.4ma)
