Hi There, Just came across your question. I also have a Sony rear projection tv KP-46WT500 and to replace my crt tubes from Sony is $176.46 a piece and I need three A red,green,blue tube. I was qouted around 1000.00 Dollars to replace them parts and labor up here in Maine But if you still have good color it's not your bulbs . Your set just needs to be cleaned of the lenses and realignned. Hope this helped. Later Richard