Take out your 1.5" thick butcher block cutting board from the kitchen and put it under your rotel CD player and also try one under your preamp. If your components are on MDF, I found that it sucks the life out your components when damping.
You could also change out the tubes in your sonic frontiers preamp to warm things up.
You might see about getting an estimate to fix the B&K as I spent $160 repairing my Carver amp which was only worth $140... and I regretted spending the money since I could have sold it by stating "Broken Carver" and someone would have spent 20-40 for it to use it as a project or fix it themselves.
You could also change out the tubes in your sonic frontiers preamp to warm things up.
You might see about getting an estimate to fix the B&K as I spent $160 repairing my Carver amp which was only worth $140... and I regretted spending the money since I could have sold it by stating "Broken Carver" and someone would have spent 20-40 for it to use it as a project or fix it themselves.