Hartley Peavey founded Peavey Electronics, one of the world's largest manufacturers and suppliers of musical and professional audio equipment, in 1965, having built his first amplifier in 1957.
Switchcraft is a leading supplier of a broad line of jacks and plugs for audio applications.
Hammond Manufacturing offers a full range of transformers, chokes and enclosures.
MXR is a manufacturer of effect pedals based out of Rochester, New York. Their pedals are known for their utilitarian designs and rugged stompboxes.