Very nice amp , was redone on inside a few years ago
Item Tag: Dynaco ST-70
Dynaco ST-70 Tube Amplifier VTA Driver Board, New Matched Tubes!
Dynaco ST-70 tube amplifier with upgrades! Uses 3 12AU7 tubes. Also installed are triode/pentode switches to select between triode and pentode modes on the output tubes. Triode sounds more midrangy with a little less power and pentode is more linear with more power.