6DN7 Sylvania NOS 1970 era (39ma and 7.5ma)

6DN7 Sylvania NOS 1970 era

39ma Gm=13,100

7.5ma Gm=2600

Tested on Amplitrex

1 section) Good NOS Ma=35-40ma and Gm=7000-7700

1 section) Good NOS Ma=8ma and Gm=2500

– Bottlehead S.E.X. amp (Headphone amp)
– Bottlehead SMACK
– CONN organ console amp 1970”s 2 channel
– MFA Luminence preamp 1990