A CRT is a old school television, most retro game consoles tend to have a bit of a input lag if you try playing them on a HD tv. The consoles were designed to work with CRTs, I believe the refresh rate is different between a CRT and HD tv. Anyways for those who have old school consoles, do you have a CRT to play your older games on? I have a small CRT, it can only output audio in mono though unfortunately but it gets the job done. I just set up my Super Nintendo today so I can play Pokemon Yellow on my TV!