I am getting more background noise from my Peavey Bravo 112 than I would like (see specs and signal diagram below). I play at home at fairly low volumes, often very clean or using pedals for gain through the clean channel, so the noise is very noticeable and distracting to me. I know that I can expect some noise from a tube amp but am wondering what I can do to minimize it. Less than a year ago I replaced all the tubes with new JJs. Less than a month ago I replaced the stock speaker with a Warehouse G12C. There was no significant change in the amount of background noise, but I think it sounds noticeably clearer - as hoped for! The electronics have never been opened, modded or serviced. The issues I'm describing are with no instruments or cables plugged, and not detecting any typical EMF noise from phone, lights, etc. I noticed that the reverb adds a lot of noise as the level is increased. I disconnected the tank to isolate it as a possible source. With the reverb control at 0 this improved the background noise a little, so that is one possible source. But turning the reverb control up immediately adds noise and a significant hum the same as with the tank connected. I expected the control to be ineffective with the tank disconnected, so this seems to indicate something between the reverb tank and power stage. Is this a wrong conclusion? In the short term I can live without the amp reverb, but I do want it to work. With the reverb disconnected and level at 0, the clean channel is improved a little bit and is not too bad up to about 3-4 on volume, then the background noise gets quite noticeable. Adjusting the High EQ rolls the noise up/down, but the other bands do not affect it. On the gain channel the noise is much louder even with Pre and Post gain levels just above 0. All the EQ controls affect the noise, especially the Body (mid EQ) control. Turning up the Pre gain increases the noise. That would be expected, but I wonder if it can be reduced. Are there specific 12AX7s or compatible tubes that would be quieter? Any other steps to clean up the pre-amp? I noticed that with the Pre gain set at 0 turning the Post gain up increases the noise. Assuming both the clean volume and Post gain are acting on the power stage it seems like noise is being added here. Would different power tubes make a difference? If the easy answer is to take it to an amp technician that's fine, given the amp is 30 years old it probably needs it. But I'm on a bit of a DIY kick so would like to rule out things I can do myself - e.g., different tubes, general cleaning/maintenance that doesn't require special knowledge. Thanks for any advice!