Dimensions (WHD) 5.75 x 3.75 x 1.75 inch / 146 x 95 x 44 mm. Notes. The Zenith Royal 275-B is a battery operated 7 transistor portable BC band receiver. The BC band frequency tuning range is 540-1600kHz. Has push-pull output stage and earphone jack that disconnects the speaker for private listening. The Zenith Royal model 275 is available …