The Tektronix Type 1121 Amplifier is a self-contained two stage amplifier designed primarily to increase the sensitivity of the equipment with which it is used. Overall gain of 'the unit is 100. Thus, with maximum input of ±10 mv, the output is ±1 v. A cascode-type step attenuator permits attenuation of the input signal from IX to 500X in nine calibrated steps. This allows a signal of up to ±5 volts at the input connector without overloading the amplifier. Connection between the Type 1121 and the equipment it is to drive is via a matched 93-ohm coaxial cable, so that the separation of the instruments may be 100 feet or more. As in all Tektronix instruments, primary emphasis has been placed on the achievement of optimum transient response. The pass band of the Type 1121 is in excess of 17 megacycles. Its compactness and versatility make the Type 1121 well adapted for use with any oscilloscopes or other equipment employing wide-band amplification.