I just watched the video at
[Link: remotecentral.com], about laserdisc players, video quality and such.
FWIW, I know a guy who has a Sony 854-4 tape recorder, recently brought up to spec. That's the model we used to use to do live recordings at the Whisky A Go Go and the Troubadour (though we did B B King at Chino State Prison, too), all for broadcast after being mixed down from our original four channel recordings). This was from early in 1971 to 1974.
One of us had been a DJ (and owned a hi fi store) and convinced the program director at a local rock and roll AM station that playing live recordings or people in town would be cool. We geared up, having bought product at wholesale, and recorded about twice a month.
The first group we did was Seals & Crofts; we a recorded a pretty shy Carly Simon soon after, and went on to record maybe fifty bands. We even did B B King at Chino State Prison. This all was mixed down from our discrete four channel tapes to mono for AM and stereo for FM. We did John McLaughlin at the Whisky in LA's first Sansui QS Quad-encoded live broadcast.... Nitty Gritty Dirt Band... Hell, Jo Jo Gunn, BTO, America....
The bummer was that once the Musicians' Union heard about this, they sent out a fifty-year old guy in a suit to watch over us each time. He was to be sure we didn't make copies for ourselves. It was all destroyed after fulfilling the contractual obligation to play it on the air.
The best one had to be the Gospel Music Workshop of America's Mass Choir in a huge Methodist church in downtown LA. Three days of recording!