A cartridge type magnetic tape recorder has a planetary gearing mechanism for increasing the speed of rotation of the capstan shaft, to increase the speed of transport of the tape within a cartridge without increasing the speed of rotation of the associated drive motor. The planetary gearing mechanism has a sun gear secured to the capstan shaft and together with a ring gear is rotatable with the capstan shaft during normal operating conditions. By stopping rotation of the ring gear, the speed of rotation of the sun gear and, in turn, the capstan shaft, will increase to transport the tape at a faster rate.
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