$5k Upgrade

I second Chayro. Clean up your power. Not only do you want clean power for your amp, but the amp feeds garbage back into the line, where it can be picked up by your sources. Isolation transformers solve that problem, for considerably less than $5K.

You might want to consider cleaning your records with an ultrasonic record cleaner. I built my own, for less than $5k, around an 80KHz German commercial unit (Elmasonic). Cleaning records at 50C and multiple rinses get me as much more music as a major component upgrade. And it's not exactly bad for the stylus, either (pay for itself? perhaps). Look up the ultrasonic thread on DIYAUDIO.