My first amp was an Acoustic head of some sort that I can't actually remember, but may have been a 200; this was about 20 years ago. Utterly nondescript tone and would cut out about every 5 minutes. If you picked it up and dropped it from about 4 or 5 inches you would magically get sound out of it. I figured out it was a cold solder somewhere and a friend of mine dug into it and found several cold solders that he repaired. I picked the thing up for about $100 along with an matching cabinet with no speakers for $50. I dropped a couple Eminence 15's in it and it just never sounded good, nor developed any reasonable amount of volume.
I suppose it was probably some sort of highly sought after, highly collectible head and cab, but it just did not do it for me. I replaced it with a Crate B160XL and an 1810 cab that sounded far better, was louder, was dependable and lighter. I dunno if that speaks more to my bad taste in tone, or bad luck overall....