BUGERA T50-INFINIUM 50-Watt Cage-Style 2-Channel Amplifier Head with Infinium Tube Life Multiplier Silver Multicolored, (T50INFINIUM) Hand-built 50-Watt guitar head driven by 4 x 12AX7 and 2 x EL34 tubes Authentic 2-channel preamp designeverything from traditional clean/crunch to modern high-gain sounds Revolutionary INFINIUM Tube Life Multiplier technology: Switchable Class-A/AB operation for ultimate power amp voicing: Class-A for classic warmth and Class-AB for raw, high-speed power Integrated high-definition reverb with dedicated Reverb control