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A compact transistorized linear amplifier has been designed that is suitable for many radiation counting applications. The amplifier delivers symmetrical double-delay-line differentiated output pulses, up to Â± 10 volts in amplitude with a differential non-linearity of Â± 1%. It tolerates input signals 400 times full scale without producing spurious output pulses. Both a prompt output and one delayed by two microseconds are available. The clipping lines and the signal delay line are all terminated at both ends so that physically small, relatively imperfect delay lines can be employed. Five amplifiers occupy only 12-Â¿ inches in a standard 19 inch relay rack.