I was experiencing problems with my CRT. I was getting the purple/green blob on the lower left corner every few days. I moved my surrounds and degaussed. Time would go by and the blob would come back. I moved the speakers farther away and repeated the process and the Blob would still come back. I ended up moving my subwoofer and well, but the problem persisted. I have my receiver below my set on a shelf system. I noticed the other day that turning my receiver on and off would sometimes produce pulsed on my screen and sometimes this would result in the blob. Sometimes switching it off/on again would pulse the screen and make it go back to normal. Is this something that is a normal occurance for a receiver being too close to a CRT. Do I need to move my receiver and if so, how far away should it be?