NASHVILLE, Tenn. — The historic RCA Studio A, saved from redevelopment three years ago, on Saturday completed a restoration to its 1960s heyday with the installment of the building’s iconic signs.

Object Details maker Radio Corporation of America Description (Brief) A plastic 8-pin base with center post, T-shaped metal envelope. Stamped: “[RCA logo] Radiotron / Made in U.S.A. / 12SJ7 / XE1 / ...