The power stage of the VH4 is rated at 100W, driven by four JJ KT77 output tubes. Power amp controls include a master volume (maximum clean volume at around 1’o’clock, beyond that adds power amp distortion), global presence (centered at around 4K) and a “Deep” knob, which is an active bass control that adds low end punch (centered at around 90 Hz).
Each power tube has a tube fault indicator and a separate fuse. In case of tube failure, the fuse blows and takes the tube out of the circuit, allowing continued use of the amp until a repair can be made.
With extensive MIDI control built in, the VH4 does not come with a foot switch, as players have wide switching options. Optional: The Diezel Columbus Midi Switcher; search under ‘Accessories’.
