Dynaco was an iconic American hi-fi audio manufacturer founded in 1955 by David Hafler and Ed Laurent in Philadelphia, Pennsylvania, becoming legendary for affordable yet high-quality audio components during the 1960s and 1970s golden age of tube amplifiers. The company emerged from Hafler's previous work with Acrosound transformers and revolutionized the kit amplifier market with their famous ST-70 tube stereo amplifier, which sold over 350,000 units and became the most popular tube power amplifier ever made. Dynaco pioneered the affordable kit approach with pre-assembled circuit boards, making high-end audio accessible to hobbyists, and expanded into speakers through collaboration with Danish manufacturer SEAS, producing the acclaimed A25 bookshelf speakers. After becoming a Tyco subsidiary in 1969, Hafler left in 1974, and Dynaco was liquidated in 1980. The trademark is now owned by Radial Engineering Ltd. of Vancouver, British Columbia, who registered it for professional audio equipment including amplifiers, preamps, and signal processors, continuing the Dynaco legacy in modern professional audio applications.