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The high power distributed amplifier system for the Princeton-Pennsylvania Accelerator employs a total of 166 Eimac 4CX300A tetrodes to achieve an average power gain of 5000. The system is designed to work over a range of frequencies of 2.5 to 30Mc/s, but is capable of amplifying 60 Mc/s at a reduced duty cycle. The high level stages of the system limit the effective duty cycle to 25%, at the normal range of frequencies. Design criteria and practice are discussed.