The WA301 is a DC to 1MHz amplifier with a maximum output (e.m.f.) of 30 volts peak to peak from a 50R source impedance. A 600R output is also provided. The unit can provide up to 15 volts peak to peak into a 50R load and can drive up to 300mA peak into a low impedance or short circuit. Fully variable gain between x1 and x10 is provided by a rotary vernier with calibrated end stops. A -20dB output attenuator is also incorporated. An "output clip" LED is provided to warn if the output amplitude exceeds ±15V.