So the 400 sounded fantastic after the WO parts installed when connected to the front end of my ADCOM setup. I then put the 400 back in its place with the 2000 and I notice a low hum coming from the 2000. It gets louder if I just touch a fingertip to any of the buttons on the front and gets louder with the more buttons I touch simultaneously. I plan to rebuild the whole thing with new electrolytics and the 2134 opamp upgrade. Is there anything I should look into for that hum or rebuilding in general?
