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A redundant transistorized pulse amplifier is described, composed of a remote preamplifier operating at -80Â°C and a main pulse amplifier. Active parallel redundancy is used in the preamplifier as well as in the main amplifier. Common feedback between the parallel redundant amplifiers stabilizes the voltage amplification in spite of component failures in one signal path. Delay-line pulse shaping is employed to reduce noise and to eliminate the detrimental effects of pulse pile-up.