Throughout the original Sunn Amplifier line they employed Dynaco designed and built transformers (up to the 120 watt MK VI transformer set) and Hafler based power amp designs until Sunn stopped producing the original line of tube amplifiers in favor or the solid state Concert and Coliseum models. Thus, the Sunn Musical Equipment Company was founded. At this point the Sunn amplifiers still relied on the Dyna power amp circuitry, reworked to fit Sunn's own chassis but still employing Dyna produced and branded transformers and the same electronic design. By 1965, the demand for Sundholm's amplifiers had increased to the point where the family garage could no longer be used as the manufacturing facility. The early Sunn amplifiers relied heavily on David Hafler designed tube amplifiers and preamps sold by the Dynaco Hi-fi company, with many of the first units actually containing power amplifier chassis sold by Dynaco (models MKII, MKIII, MKIV) as well as modified Dyna PAS1 preamplifiers.

By 1964, the Sundholm brothers had designed a high-powered concert bass amplifier. Sundholm enlisted the help of his brother Conrad to help solve his problem. Bassist Norm Sundholm discovered that his bass amp was not nearly powerful enough to play larger concert halls. Because the band was used to playing small hops and school dances, many of the members found themselves ill-equipped with the amplifiers that they were currently using. After its hit single, the band soon embarked on a 50-state national tour. In early 1963, the Kingsmen, a band based in Portland, Oregon, became known for their hit version of the song 'Louie, Louie'.

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