you need to be in the service mode. from the keypad or remote: enter, enter, up, down, enter. I think you have to scroll down to the last line to find the crt info. If you can get the lens off you should look at the tubes. The lens are very easy to take off.
I'm assuming you're asking because looking at buying a used projector off of someone. If you have absolutely no idea what to check or what to look for, or where the lenses are, then I would suggest to you that you buy a CRT projector from a reputable reseller instead.
CRT's are a bit to work to set up as well. Are you sure you're willing to do this?
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