Magnavox owned Ampeg from 1971 to 1980. This was the period that saw the introduction of the legendary SVT, among a whole slew of great tube amps. The V series amps remain the gold standard for Ampeg amps. And because they don't have the collector cachet of lesser amps (IMO) like Fender and Marshall, prices are still quite reasonable. Surf through eBay for Ampeg amps made in the 70's and you'll see what I mean.

The SVT was originally intended to be a bass amp, but the Rolling Stones used the first prototypes for both bass and guitar on their '71 tour. The V-9 was introduced as a guitar version of the SVT, but with the SVT being bought by so many guitar players, the V-9 never saw huge production. The V-4 was a 120 Watt guitar head, and the V-4B was a bass version, without reverb. The V-2 was a 60 Watt head. The V-4 amp was also built into a 2x12" combo called the VT-22. The V-2 was built into a 4x10 combo called the VT-40. There was no bass version of the V-2, since that was covered very well by the B series amps, which also sound great for guitar.

For guitar, the 'golden age' of Ampeg runs from the late 60's when Ampeg was based in Linden, New Jersey, to the late 70's as the Magnavox era wound down in Elkhart, Indianna. It's a wonderfull irony that Ampeg was started by Everett Hull, a man who hated Rock'n'Roll. The amps his company built pretty much defined the sound of Rock in the 70's.