The Bogner Shiva Tube Guitar Amp Head with 6L6 Power Tubes features two highly evolved channels, capable of clean tones that shimmer like icicles in winter, and tube saturation so powerful it should be illegal. Foot-switchable boost function for both channels, variable for channel 2. 6L6 models have a touch more lowend/highend extension than the EL34 Shivas, giving these 60W heads a more American-style. The Shiva also has a tube-buffered, series FX Loop.