Revv D20 Amp Head WH, Tube Amp Head for Electric Guitar, Small and lightweight, Switchable from 4 Watt to 20 Watt, Built-in Two Notes Reactive Load & Virtual Cabinets (6 customisable virtual cabinets selectable via the front knob or up to 128 via MIDI, without speaker directly connectable to mixer, interface or headset), In the Reactive Load Direct Mode, the Pre & Post switch selects whether the power amplifier is in the signal chain, Reactive Load is automatically activated when no speaker is detected to protect the amplifier, 1 Channel, Power: 20 W, Preamp tubes: 2 x 12AX7, Power amp tubes: 2 X 6v6, Controls: Gain (push / pull for more Crunch), Treble, Middle, Bass, Volume, Virtual cabinet, Switches: Standby, On/Off, Power 4/20 Watt, Pre/Post, Impedance 8/4 Ohm, Groundlift, Internal Load/Speaker, Speaker outputs: 8/4 Ohm (6.3 mm jack), Effect loops: Buffered Series, Guitar input: 6.3 mm jack, Headphone output (6.3 mm jack), MIDI input, USB, Balanced Output (XLR), FX Loop Send / Return (2 x 6.3 mm jack), Speaker output (6.3 mm jack), Dimensions (W x D x H): 310 x 160 x 190 mm, Weight: 4.1 kg, Colour: White, Made in Canada