So, on Monday night I went to an arcade for the first time since I've started collecting PVMs and broadcast monitors.
Even the PVMs at 600 lines of resolution seem to have thicker scanlines and a more razor sharp picture (via RGB) than most of the cabinets I was seeing. Almost all of the games were pre-1990s.
I was slightly shocked to see such a soft picture on the arcade cabs. It seems like the games were not nearly as lossy as I've seen via the best composite connection, but not near as razor sharp as a PVM via RGB. They are somewhere in between. It could have had to do with the type of pixels in those old monitors.
Every standard consumer CRT isn't as sharp as it could be! They are always
slightly defocussed to reduce the scanline effect. You get a sharper picture
on a production CRT. It is more in focus so to speak. Hence, you will see the
scanlines much better but also some moiré patterns because the low-pass
filtering effect of the image due to the scanning beam is much reduced now
(leading to some aliasing). With a production CRT you get the sharpest picture
to see every detail there is. On a consumer CRTs it will only get worse, i.e.
blurrier. So on a consumer CRT one will miss some picture detail so to speak,
but you won't see the scanlines (from the design viewing distance, as well as
no moiré pattern due to the raster).
Back in the days of designing the "CRT standard" for the living room, it was
agreed upon (after having made many tests) to defocus the beam slightly such
that the scanlines weren't visible at the design viewing distance.
It's very likely that the arcade CRTs are even more defocussed than standard
consumer CRTs due to the closer viewing distance with respect to the CRT
within the cabinet. As such the picture will be less sharp. But you won't see
scanlines (most likely).
Well, you can get some pronounced scanlines with any standard CRT by simply
tinkering around with the focusing lense. But listen. By doing so, and without
any experience, you may ran the risk of not being able to adjust the focus
again properly.
Can CRT monitors lose sharpness with age? It'd make sense based on what I saw. ...
They can. The vacuum becomes slightly dirty over time influencing the beam.
Another issue is when the cathode (the gun) starts to wear out and you start
to compensate for this loss. Basically, whenever the electrostatic and/or
magnetic field within a tube moves away from its designed operation point
(due to outside forces/wear or wear within the tube itself), you are prone to
loose picture quality on many levels.
... Plus the fact that I was on a date with a cute girl who kicked ass at frogger and TMNT didn't hurt. ...
Pix or...