Dynaco is an American hi-fi manufacturer, founed by David Hafler and Ed Laurent in 1955, that earned enduring fame for its wide range of affordable component kits. Dynaco is best known for its highly regarded Stereo 70 vacuum tube amplifier. Introduced in 1959, the 35 watt per channel Stereo 70 (or "ST-70") was sold until mid-1990. With more than 300,000 ST-70s produced, it is the most popular tube power amp ever made. Dynaco electronics were available either factory assembled or in do-it-yourself kits, Dynakits. These kits were different from the popular Heathkit products because of their preassembled circuit boards. These boards were wired at the factory, tested and packaged with the unassembled chassis. The builder was left, largely, to attach the switches and controls to the chassis pieces, assemble the chassis and power supply and solder connecting wires to the circuit boards. This saved considerable time and reduced errors on the part of the builder. Because of their excellent sound quality, low noise, and reasonable prices, Dynaco tube amps were often referred to as "the poor man's McIntosh." Even today, upgraded components, rebuild kits, and even a complete improved reproduction of the ST-70 is available.