Featuring a preamp section powered by four 12AX7 tubes, a power amp sporting dual 6L6 tubes, dual clean and overdriven channels, and individual three-band EQs on each channel, the Bogner Uberschall Head summons the best bits of the company's mastery of amp-making in one flagship unit. German for "Super Sonic," the Uberschall is renowned for its immense, inimitable bass presence that allows for the wildest distorted settings to stand at the fore while retaining the clarity and focus of the tone.