 A brief entry into the audiophile market in 1970 with the V-M "Professional Series" was technically successful - but by this point, V-M Corporation was too financially weak to back a successful marketing campaign, so these products are rare and sought after today.First and foremost, V-M was a record changer and tape deck supplier (less the electronics) to dozens of familiar brand names of their day, such as Zenith and Motorola to name only two.V-M Corporation, from the late 1950s through 1968, was the world's largest record changer manufacturer.