I have a little amp I got way back years ago that I believe came with my very first Ibanez bass. Although it doesn't get the best tone and sound, I use it from time to time because it is easy to carry from place to place. Tonight I was playing on it on an Ibanez bass for a minute, everything was going fine. I unplugged that bass and plugged in my fender bass and when I went to play no sound came out... I went back to the ibanez bass and it doesn't work now either. I've tried 3 different cables and that didn't seem to fix the problem. I don't think I've blown the speaker as if I turn it up to like 10 I can hear the amp making sound. But if I plug in a cable and touch the end of it I hear nothing. My best guess is the input jack, any ideas? And if so how would I go about repairing it. Thanks!