Is the picture a little blurry? Clarity is your issue?
Here are things I'd check right away... Calibrate the focus of the tube. The control knob is the upper of the two on the monitor flyback transformer.
('brightness' is really screen voltage B+)
If this is not the problem, look close at the CRT, especially white letters or put the screen in "cross hatch" monitor test pattern.
Do any of the colors not converge well? Like, is there an alignment problem where the red strays from the other colors, for example?
This picture exaggerates the issue:
This issue is a bit more complex and involves aligning the focal rings along the neck of the picture tube. A very time consuming, frustrating procedure often
The other concern is that your emulation is presenting at clear native resolution and not scaling anything. I doubt this is the problem as it's usually more a concern with older games that use 224 vertical lines while video cards tend to only render at 240 and the rest often gets scaled to fit (yuck!).
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