The New York investment banking house Goldman,...

The New York investment banking house Goldman, Sachs increased its stake in Glendale-based Citadel Holding Corp. to 8.4% from 7.4%, sparking increased speculation that the savings and loan firm is a takeover target . . . RCA said it plans to spend $112.7 million to expand facilities and install new manufacturing equipment at its color television picture-tube plants in Scranton, Pa., and Marion, Ind.