I just bought a Bell Carrillon PA amp to restore into a guitar amp. I knew it'd need a cap job so I went ahead and turned it on to see if there were any other problems and the hum came in. The problem was that, with an iPod plugged into 2 channels as bridged stereo it still didn't give much volume. The preamp tubes are good and the power tubes are good RCA black plate 6L6's. Should I worry about it until after I replace the caps or is it something I need to address seperately?