【SPEC】 Features:Single Channel, HYBRID Class D Power Amp with Valve Preamp, Clean Switch, Variable Input Sensitivity for Active or Passive Basses, Balanced DI Out, Fx Loop Controls (Right to Left):Natural Channel: Volume, Bass, Middle, Treble, Gain Valves:Preamp: 1 x ECC83 (12AX7) Output Power:250 Watts Into 8 Ohms, 500 Watts Into 4 Ohms. Effects Loop:12AT7 Valve Driven SEND, Solid State RETURN Unboxed Dimensions:30.7cm x 19cm x 16cm Unboxed Weight:4.65kg