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6N7GT RCA used/good 1940's
2.4ma Gm=1200
2.3ma Gm=1100
(6N7=6A6=ECC31, 6N7=Type 53 with different filament voltage, also see 5694)(the best sounding 6N7 type ever made is the ECC31 Mullard)- Sun Audio SV-6V6SE 2008