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Norm Sundholm, bass player for the Kingsmen, complained that his bass amp was getting lost in the mix. He sought assistance from his brother Conrad, an electronics enthusiast. Conrad built a cabinet which became the 2-30/C60.. a bass amp that would set the music world on its ears.

Other musicians were soon in awe of the Sundholm brother’s amplifiers. Norm and Conrad started to receive orders from guitarists and bass players who had to have one just like it. Conrad set up shop in his dad’s garage, started building what would become SUNN amplifiers.

Although the Brothers Sundholm had enjoyed a great deal of success, receiving endorsements from the Rolling Stones, The Who and Jimi Hendrix, they had quite different views on running the business. At the end of the ’60’s, Norm sold his interest in Sunn to Conrad and went on to pursue a career in real estate.”….

Then in 1971, Conrad sold the rest of SUNN to the Hartzell Corporation, a Minnesota based conglomerate.

Hartzell continued to make SUNN amps throughout the ‘70’s and into the early ‘80’s, until a tragic plane crash took the life of its President, Tom Hartzell. His surviving family did little with SUNN amplifiers, and decided to sell it a few years later. [Source: The Sunn Shack]

http://en.wikipedia.org/wiki/Sunn

Sunn amplifier catalogs & brochures

1966 http://users.nac.net/the/gear/SunnBroch.jpg

Sunn schematics

http://www.freeinfosociety.com/electronics/schempage.php?cat=1

Sunn Sceptre Made in USA Portand, Oregon Sunn 1968

Images of 1967 Sunn Sonic 1 and Sunn 212 combo , Manufactured for only one year, (1973-1974) both from eBay