SAE or Scientific Audio Electronics was a force in the audiophile world in the heyday of the late 1970's and into the 1980s. Founded by Morris Kessler in 1968, they were based in Los Angeles.
Notable SAE products included:
SAE Mark II power amp
SAE X-Series electronics
SAE 02 Series
SAE is no longer in business today, though Morris Kessler now makes amps, now under the ATI brand.
For a history of SAE, visit the Wikipedia page.