Bugera 333XL INFINIUM Hardcore 120-Watt 3-Channel Tube Amplifier Head with Reverb and INFINIUM Tube Life Multiplier Hand-built and hand-wired 120-Watt Class A/B amplifier driven by 4 x EL34 tubes (now fully compatible with 6L6 and 5881, etc.) Modern 3-channel preamp design (Clean, Crunch, Lead) featuring 4 x 12AX7 tubes for boutique clean and face-melting hi-gain tone Integrated high-class reverb is assignable per channel and has a dedicated Reverb control Revolutionary INFINIUM Tube Life Multiplier technology: Extends the life of your amplifiers expensive power tubes up to 20 times. Provides incredible reliability and consistent tone over the complete lifespan of your tubes  No need for expensive matched tube sets Allows you to mix and match any combination of compatible tube types and brands  Monitors performance of each power tube continuously and displays defective tubes to allow for easy and individual replacement XL switches on the Lead and Crunch channels for killer low end control