can anyone help me with a Boogie .50+? It's dropped its volume about half. I assumed it was tubes, so I replaced them. I started with the preamp and put in brand new JJs--no difference. So, I thought, it's gotta be power tubes. The TAD 6L6s I've got in there are a little over a year old, it's probably time. So I thought I'd try EH 6L6s. I put them in the amp and turned it on to burn them in around 2:30pm. I went to work for about six hours, came back and could smell burning or heat. I shut it off, let it cool down, and looked at the tubes. There is heat marks all along the Tube Store sticker and the right hand (from the back) tubes label is flaking off from the heat. I plugged it in again and watched the tubes heat up. That right hand tube heats up fasts and gets really hot--hotter than the other one. Pretty much as soon as I turn on the standby and the power hits them I smell heat. What's going on?