NEC Mitsubishi Diamond Plus 220 22" CRT - 15khz compliant?

[jimmy2x2x]

I cant seem to find much information online

Anyone happen to know?

Thanks

[Jack Burton]

http://www.nec-display-solutions.com/p/download/pr/File/cp/Products/CRT/Supported/CRT-DiamondPlus220/Datasheets/PDF-Datasheet-DPlus220%28english%29_x_en.pdf?e=e1s1&fn=DPlus220-Datasheet-english.pdf

Datasheet says the sync range is 31-110khz so it looks like you're out of luck for true 15khz.

However, this monitor will still be able to display native arcade resolutions through doubling the refresh rate of the modeline.

This isn't possible to do with a real pcb, but is fairly easy with a PC. 

However, be aware that this is a very fine pitched CRT.  It would have been used for graphic design or video editing when it was new.  The colors and contrast will be excellent on it, but playing games in low res will result in much more noticable scanlines than with a typical arcade monitor. 

I would say you should try it out and see how you like it.  If the 15khz games don't look good to you on it you should try some 31khz ones.  It can do those completely natively.  Any naomi or dreamcast game is going to look incredible on that monitor.

[jimmy2x2x]

Thanks Jack

Sounds like a decent option for me

One thing that concerns me slightly - they buyer tells me that the monitor auto degausses about every 8 hours, have you ever encountered that?

[Jack Burton]

No.  In fact that sounds like a different issue altogether.

Many of the trinitrons develop a "pop" issue.  This means that every so often the screen will gather static electricity and begin to become blurry.  It will do this for several minutes, and then *POP* a big static discharge that will mess with your eyes.  

Over time they'll do it more and more until the overall focus is lost on the monitor.  I'm not sure what causes it, but I'm guessing a failing power supply or flyback transformer.  

I had a monitor that would do this every few days for about a year before it finally went out.  So, if the price is right for the monitor you might see if you can get what usability out of it you can. 

[Gray_Area]

Given HLSL, I would find any decent 21" PC CRT (22" are harder to find). I got one the day for $20 off Craigslist. Unless it's new (which is really rare), check it out before you buy, because some have been run hard, brightness-wise.

[Jack Burton]

Yeah, HLSL would actually work pretty well on this monitor.  Seems to be strange to run a CRT emulator on a CRT, but in this case you're running the emulator to make it look like a different CRT.

Try downloading it and running at 1600x1200.  You might have to fiddle with the settings a bit but the end result should be very nice, and will give you a preview of how it might look on an LCD if you decide to go that route. 

[MonMotha]

Many of the trinitrons develop a "pop" issue.  This means that every so often the screen will gather static electricity and begin to become blurry.  It will do this for several minutes, and then *POP* a big static discharge that will mess with your eyes.  

Over time they'll do it more and more until the overall focus is lost on the monitor.  I'm not sure what causes it, but I'm guessing a failing power supply or flyback transformer.  

I have been told that this is a tube issue (not a full short, but some gunk causing a path that will eventually arc over) combined with a bum flyback (due to the tube fault).  It can apparently be fixed by clearing the short with a tester/rejuvinator and replacing the flyback, but I've not actually done it as none of my Trinitrons have had this problem.