Quite strong quality studio symmetrical amplifier circuit supply voltage + – 2×70 total of 140 volts dc volts DC Volts high voltage, be careful. Of the amplifier to the power supply 500 Watt 2 × 50-volt transformer see your... Electronics Projects, 350 Watt Studio Amplifier Circuit MJL21193 MJL21194 "audio amplifier circuits, transistor amplifier, " Date 2019/08/01