Transistors Tl and T2 form a voltage amplifier with a high input impedance and a low output impedance. When the # slider of preset potentiometer P 1 is set to give the full value of 1 k, the input sensitivity in combination with the 3-watt amplifier is about 150 m V for the 12-volt version working into a 4...Q load, or 200 m V for the 17-volt version working into an 8...Q load.
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