I have a 5 year old Fender BXR 60 Amp which is humming. I am assuming something electrical needs replacing. When it was working well, it was ideally suited to my needs and I liked the sound. I can buy another working used one for about $180, delivered. The questions are: Do I try and have it fixed or just buy another used one? If I do buy another can I use one for parts or is that stupid on a relatively cheap combo? Or do I just trash it and buy a brand new combo of something similar?