Instruments Inc. has been providing solid-state power amplifiers since 1965. Based in San Diego, Calif., the company's major programs are sonar and low frequency radio transmitter systems. Its on-site metal shop provides fabrication services for sheet metal and machined parts. Instruments Inc.'s product portfolio includes a range of switching amps, linear amplifiers, as well as test equipment. The company subcontracts processes, such as PWB etching, painting, large volume PWB assembly, metal fabrication and a few other specialized functions.