TWS BassBoy Top; tube bass top section; 50 Watt RMS, switchable to 30 Watt; 2x 6L6 power amp tubes; 1x 6SL7 preamp tube; 1x 6SL7 paraphase phase inverter; GZ34 rectifier tube; preamp control with "Ultra-Bright" function; 3-band tone control with bass, treble and character control; Post Phase Inverter Master Volume (PPIMV); 4/8/16 Ohms speaker impedance selector switch; Transformer balanced DI-Out (XLR) with GND-Lift switch; WxHxD = 530 x 260 x 260 mm, Weight: 14 Kg; Operating voltage switchable between US and EU standard