The Dr. Z MAZ-38 is a truly versatile amp for the working or studio musician. Whether your forte' is Blues, Country, Roots, or Rock, The MAZ 38 Senior will fit the bill. Power Output: 38 Watts Output Tubes: 4 - EL-84 Preamp Tubes: 4 - 12AX7, 1 - 12AT7 Rectifier: 1 - GZ34 Controls: Volume, Treble, Mid, Bass, Master Volume, Cut