It depends on what you mean by “my CRT”. Are you talking about an external broadcast monitor CRT or TV that you are feeding via firewire? or are you talking about your PC monitor CRT? If it’s an external CRT there are many tutorials on the web on how to calibrate monitors. Just Google “calibrate ntsc monitor”. It is beyond a simple forum post. Yes, you will need a blue gel if your monitor doesn’t have a blue gun switch.
If you are talking about your computer CRT there is no way. Computers CRTs are not going to give you the same color space that an external monitor via firewire will and you can’t trust the colors for color correcting. In fact, you will never get the pluge adjustment right.
If you just want to make the colors on your PC display more accurate, you can buy a calibration tool like the Spyder3Pro which will calibrate your PC monitor far better than your eyes ever could.
~jr
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