When I first picked up the bass as a teenager I just happened to have an opportunity to buy a used Ampeg V4B with a Kustom 2x15 cab from a musician friend of mine.
I had no idea what gear was good or what was bad, but this was what was available and so I bought it.
As I've since learned, the Ampeg V4B was a remarkably good amp, especially for its day.
Unfortunately, I only had it for about a year because it got blown up. My band at the time rented a rehearsal space and I always left my amp set up there because it was secure. But the guitarist decided to throw a party there and invited some of his friends to hang out there and drink and do drugs. Of course, they fired up the music gear (drums, guitar, bass, PA) without permission from the owners.
One of these nitwits had heard that Tom Sholz (the guy from the band, Boston) got his guitar sound by cascading two amp heads together. What Tom did was take the preamp out from one Marshall amp and run it into the input of a second amp.
But the dumdum who borrowed my amp didn't quite understand the concept so he took the speaker out from the guitarist's Marshall head and ran that into the input of my Ampeg V4B.
He was quoted as saying that it sounded "really cool" for about three seconds before it went poof.
He actually paid me $100 for the head in restitution after I sold it for $50 for parts. It was worth a lot more than that, but I consider myself lucky to have gotten anything from his broke ass.