(!!!!) (Best Value Pair 1940's) VT-231=6SN7GT RCA used/very good gray coated glass copper grid posts 1940's (8.4/8.2ma and 7.5/9.0ma) (close Gm)
(!!) 6SN7GT Raytheon taller bottle parallel black plates NOS 1949 (8.2/8.0ma)
