A pre-amplifier is an indispensable device for controlling a power amplifier, such as e.g. our K4040 valve amplifier or K4020/K4010 MOSFET amplifiers. When developing this pre-amplifier we opted for DIGITAL control of all functions, so that it contains no potentiometers at all ! All functions, such as volume, tone control, balance and input selection can be operated using push buttons and a LED display gives a clear indication of all settings. All functions may be operated with a remote control unit (K4101 available as option).