So I bought a Hot Rod Deluxe a few months back and a few weeks after I got it I noticed some fluxuations in the sound. It would be normal and then intermittently get weak for a few seconds and go back to normal and go back and forth like that for a bit. The reverb would also completely cut out as well (reverb is solid state on these I believe). After a while it would stop happening, I'm assuming after it warmed up. Lately it's gotten a lot worse, any idea what could be wrong? Could it just be that I need a retube or could it be something worse?