My very good friend has a pair of these Wave 8 Antique Sound Labs mono amps. I borrowed them for 10+ years or so to use in my office. I used these with an Adcom 555 Mk II preamp with a Sumo Delilah crossover into a pair of Kef C10 cabinets (with a small sub). A modest system that I used to playback signals from various PC’s and a ProJect turntable in a very small office environment.
The build quality was decent considering the price point. Each amp chassis was quite compact with a power switch on the front of the amp. 1 RCA input with the power socket on the rear. More power than you’d expect. While warm sounding and reasonably neutral, I didn’t think they were overly accurate or revealing, though the mid-fi stuff I was using them with wasn’t exactly top shelf components either.
It was fun to have them around, I was thankful to be allowed to use them and I believe my good friend still has them (sitting on a shelf unused). I would not seek out my own pair based on my listening experience.
Hope this is helpful.