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The MEA 500 MeV electron linac is powered by 12 solid-state 10% duty factor line type modulators. Repetition rates up to 2000 Hz, pulse widths of 50 microsec. and RF peak power up to 4 M.W. at 2856 MHz have been obtained. Some of the modulators have been used for several thousands of hours, performance will be presented. Special attention will be given to the freon cooling system.