Power amplifier is a very versatile high fidelity amplifier and has many useful applications. Power amplifier for walkman or similar type of AM/FM stereo headphone radio, they can be converted into a high powered stereo system for home use. This can easily be done by connecting the headphone output from the radio to the input control of the amplifier. As a power amplifier for the auto, van, camper, trailer and boat, or as a portable system for outdoor use. A public address amplifier for both indoor and outdoor use.