So, what did Zenith do to make their CRT's fail quicker?

[MRX37]

I also remember reading on the repair FAQ website that someone from Thomson said their CRT's were designed to last around 15,000 hours. With a year being around 8000 hours, one of those 15,000 hour CRT's might last around 6 years if watched for maybe 8 hours a day, and by then of course something new would be out with all kinds of new features.