6N7GT RCA branded Sylvania NOS 1950”s (2.5/2.6ma)

6N7GT RCA branded Sylvania NOS 1950”s

2.5ma Gm=1400

2.6ma Gm=1500

(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