BUGERA G20-INFINIUM 20-Watt Class Amplifier Head with Infinium Tube Life Multiplier Morph Eq and Reverb Black, (G20INFINIUM) Hand-built 20-Watt Class-A amplifier driven by 2 x ECC83 and 2 x EL34 tubes Revolutionary INFINIUM Tube Life Multiplier technology: Revolutionary MORPH EQ to seamlessly sweep between USA and British EQ-style tone Amazing classic push-pull power amp design for vintage tonal character High-definition reverb with dedicated Reverb control