Engl Powerball II 100W Tube Guitar Amp Head 100W (tube)Tubes: four 12AX7 (preamp); four 6L6GC (power amp)4 channels: Clean, Crunch, and 2 Lead channelsIndividual volume/gain controls for each channelBright/Bottom switches for Clean and Crunch channelsMade in Germany It's got 4 channels and 100W of power courtesy of 4 - 6L6GC power tubes, along with enhancements like gain controls for each channel, 2 Bottom sound switches for the lead channels, mid-boost switching that affects all 4 channels, footswitchable FX loop, and an electronic Power Tube Monitoring System with LED indicator New features on the rear panel include an S A C