Hifiengine has lots of manuals and the downloads are free. I owned one of those along with most (probably with th exeption of a couple of amps and one or two other pieces) of the Phase Linear equipment more than 40 years ago (when I was 5 years old of course). When cassettes with Dolby B were the standard, when listening to FM (I owned the Phase Linear 5100 tuner back then), and when listening to TV sound (back then there was no stereo TV and I used a Pioneer TVX9500 dual mono TV tuner), I enjoyed the unit when playing back those old sources.