To start with, you're sure they're Panasonic tubes, right ? Sony tubes can be found in some 808's. Just call the VDC projection division, a knowledgeable woman will answer and tell you what to do. The website should come up with a search, it did for me anyway. Last time I asked about them they were $495. per tube plus a $25. dud charge if you didn't send in your old tubes, plus shipping.