I've had my Blues Junior almost a year--got it used from a friend. Within the last few weeks, it started making farty, crackly noises--just randomly--sometimes it was fine, other times, it would make the crackles. So I decided to change the power tubes (EL84s). I decided just the EL84s because when I would touch them, they would fart, but the 12AX7s would not. So I replaced the power tubes with JJs. I still get the crackles, and what is weird is that the tube on the left side glows really hot--a lot hotter than the right side, and just within a couple minutes. It's not just the wires that glow--it's the whole silvery sheet thing inside. I don't get it. Any suggestions?