A pulse sharpener equalizer capable of producing sharp pulses whose amplitude and width are independent of the wave form of the input signal is described. Input pulses having a width of 100 sec. to 10−4sec. work equally well and a change of bias permits operation with either positive or negative input pulses. The circuit uses all hard tubes and gives output pulses of either sign essentially the same in form as the interstage pulses in a scaling circuit, hence the resolution of the scaling circuit is not impaired by the use of the sharpener.