[1] After Putnam moved to Hollywood in 1957 and established the United Recording Corporation, his company acquired Studio Supply Co. and rebranded it as the Studio Electronics Corporation (SEC) and moved all manufacturing to the second floor of Western Recorders.

[3] In anticipation of further acquisitions, SEC was rebranded as United Recording Electronics Industries, or UREI.

UREI subsequently acquired National Intertel; from this acquisition came technology which developed into the 1176 peak limiter in 1968,[4] and the 1108 FET preamp.

By 1976, UREI had moved their manufacturing and service center to Sun Valley, California.

In 1983, financial and quality control problems at Altec led UREI to introduce the 813B, which utilized JBL loudspeaker drivers.