Abstract: An amplifier circuit for a hearing aid, for producing moderately high gain and output sound pressure levels, with extremely low current drain on the battery. The output stage uses a pair of complementary transistors, with each providing a dynamic load for the other, and a low impedence receiver. Negative feedback may be taken from an output blocking capacitor to provide sharp low frequency roll-off where necessary for certain types of hearing loss. The circuit can provide an acoustic gain of more than 38 db, at an output sound pressure level of 116 db or more, depending on the load impedence, on only 0.150 milliamperes of current from a 1.35 volt battery.