6N7GT RCA NOS 1940”s (2.5/3.1ma)

6N7GT RCA NOS 1940”s

2.5ma Gm=1400

3.1ma Gm=1700

(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