The gain and tuning pots are scratchy and need to be cleaned with some DeoxIT. Here's' what I've been told about the units preamp, rather than amplifying the signal, it creates hash, making an incoming signal unreadable and may have a failed or failing component in the preamp section. As a result of this issue I'm selling this unit for part or repair. It's in very good physical condition as shown in the photos. See pictures for more details.