That changer might not be a VM. Really, RCA might have built it and it might have a self weighted cart.
When I was a kid we had the 1966 model, maybe TOTL, not sure. Had 15 X 9 " woofers, 4 X 6 " mids and 3½ " tweeters. Amp was OTL but cap coupled, with maybe 10 or 15 WPC. Of course back then I was like Tim the toolman Taylor and souped it up and it blew all the outputs and the woofers. Think I was about 13.
The Nuvista moniker actually refers to the RF amp in the TV tuner, which is a nuvistor, a super small low noise HF amp that gave it better sensitivity than what else was on the market. I used to like DXing TV, like watching Canadian stations from Lakewood, Ohio. Problem is they used an elcheapo wafer tuner that is much harder to clean and align than a turret tuner.
Have fun with it. If it has an AUX input all the much better. If not, get your pants on and plug in the soldering iron...