Hey guys, I've recently purchased an Ampeg BA115 online. When I plug my guitar into the amp, I get some radio interference. I've never had this before, so I'm confused. I had another bass & amp combo in the same room, location, etc. before and never had that problem. Is this something expected? Can I do anything to prevent it? Also, there is some amount of hum coming from the amp. The ones I tried in guitar center didn't seem to have that much hum to me (or maybe it was less noticeable), is this a common thing in Ampeg amps? I used to have a 75W Fender Rumble, and it was much quieter.