I recently bought a TechnoSound Turbo sampler. On connecting up I discovered just how poor these devices were. I'm not sure if the Technosound is better or worse than alternatives but the amount of noise on the input is outstanding. It doesn't even sound retro; most samples in mods in the 90s were far superior to anything I could create using this.
I'm guessing either proper 'pro' solutions existed or people dumped sample data from Akai samplers or similar. Or, Technosound is just a terrible sampler.
I remember my TS sampler in the 90s sounding just as bad - so this isn't a one off 'faulty' example