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A retarding field oscillator which tunes over the range from 8,000 to 15,000 mc is described. Energy is taken from the tube by allowing the repeller, which is part of the resonant circuit, to radiate into a waveguide. Results for both inductive and capacitive tuning are discussed. With capacitive tuning, the efficiency of the oscillator is between 2 and 4 per cent over the entire range, with maximum efficiency occurring near the highest frequency.