(!!) (2nd Best Pair) 7199 Sylvania NOS 1960”s and 1985 same build (12.5ma/9.6ma and 12.3/10.2ma) 1-3% matched

1 pair) 7199 Sylvania gray plates NOS 1960”s and 1985 – same build

1 tube) Sylvania faded printing 1960”s

12.5ma Gm=7300 (pentode section) strong

9.6ma Gm=2500 (triode section) strong

1 tube) Sylvania branded Philips 1985

12.3ma and Gm=7100 (pentode section) strong

10.2ma and Gm=2500 (triode section) strong

– Bogen BD-212
– Dynaco ST-70, SCA-35
– Ampeg B25, B25B
– Heathkit AA-111
– Stromberg Carlson
– Ampex Concerto 1961
– Scott LK 150