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(!!!!) (Best Single 1941-1945) VT-231=6SN7GT RCA gray coated glass copper grid posts 1941-1945 (9.6/9.8ma)
(!!!) (Recommended Single)6SN7GT Tungsol tests like new black coated glass and black round plates 1945 (9.2/9.0ma) (close triode balance)
(!!) 6SN7GT Raytheon taller bottle parallel black plates NOS 1949 (8.2/8.0ma)
