This head has exactly the same controls and preamp section as its smaller sibling, the TH30 head - But when running in class AB1 (half power) it makes 35 watts on two output tubes, and 70 watts on four output tubes. Put it to full power (AB2 position) and the amp makes 50 watts with two output tubes and 100 watts with four. Being able to switch to half power means you can reduce the listening volume while preserving the power tube distortion. Colour: Black.