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The transistor "Leader-303" electrophone has been producing the Saratov software package since the beginning of 1973. The "Leader-303" electric phone with universal power is designed for playing regular and long-playing records. It consists of electric control unit and a remote speaker, which is also the cover of the amplifier-amplifier, which are connected when transported in one common unit. The electric control unit is made on a DC motor with electronic control and has three rotational speeds: 78, 45 and 33 rpm, they are switched electronically by a push-button switch. Each speed can be adjusted using a stroboscopic disc. The maximum output power of the amplifier when powered from the mains 2 watts, from batteries 1 watt. The band of sound frequencies of reproduced speakers is 150 ... 7000 Hz. The amplifier works on 2 loudspeakers 1ГД-40. The microphone is powered by AC power through the built-in power supply or from 6 A-373 elements. The dimensions of the phone are 362x283x262 mm, weight 5.5 kg. In 1975, in connection with the new requirements of GOST, the flashlight was modernized. It differs from the previous model in the design of the engine and the electronic control unit. Here a 6-pole brushless motor is used, with a sensor for electronic speed control. 2-speed EPU: 33 and 45 rev / min. The amplifier is also modernized and has a frequency range of sound pressure of 120 ... 10,000 Hz. The remaining parameters of both models are the same.