Cool ~ long long ago there were two AM news stations in Los Angeles and the CBS one (KNX 1070) played vintage CBS 30 minute radio shows every night for an hour . I began listening in....?1973? and it lasted until they stopped playing them, I was working the swing shift at the time and always had my radio on to listen . Good times . There's a guy in Florida who sells transistorized 'vibrators' that never quit and have better voltage control to boot, you'll only iss hearing the slight hum as the tubes warm up .