Three channel high performance reference amplifier 20 KHz to 10 MHz (DC option extends low end to DC). 3 Volts p-p into 50 Ohms, 6 Volts p-p into 1KOhm. Operates from DC power from -60 to +60 Vdc in three ranges. Harmonic distortion well below -30 dBc. Minimal additive phase noise.