I just got done setting up my second Nieman monitor and thought I'd post up some information on this new monitor.
Nieman 24.8 Multisync monitor, model # 3M25CH666
Horizontal sync - 15k, 24k and 31k (automatic) (cga, ega or vga)
Video input signal - 2.5v - 5.0v TTL OR 0.7v analog
Sync signal - seperate or composite
Connections - 15 pin D-sub with 6 pin adapter for wiring to existing Jamma harness
CRT - Flat screen CRT
Power - 100 to 240vac, no isolation required
Resolution - 560x240, 640x350 and 640x480
Adjustments - There is no on-screen menu (this isn't a digital monitor), but in addition to the usual adjustments there are pots for: pincushion, rotation, sub-contrast, trapezoid, sub V height and more. Really all the adjustments you would ever need to make (other than convergance) are provided for. Common adjustment pots are on a remote board.
This is the second one I've gotten from Amusements Plus. It got installed in a generic cab with a Carnival King Shooter kit. Out of the box this monitor has a great picture. Running in vga mode with the Carnival King kit the picture is very sharp with no convergance issues. Geometry was off some, but quickly corrected with the ample adjustments this monitor provides. Color and brightness is uniform across the screen and the light gun registers perfectly all the way to the extreme corners of the tube (something that can be tough to get on other monitors). Overall I am very pleased with this one, the picture has great color and excellent contrast and sharpness and works great with the light gun without having to be even the slightest bit over-bright.
The first Nieman monitor I got went into an Cruisin' USA and right back out on location so I didn't get the chance to play with it at all, but that one had very minor convergance issues, mostly at the extreme edges. Besides that, it too had excellent color and contrast and good sharpness, even at the medium res that Cruisin' runs at.
I have yet to try one of these at standard res.
First impressions of the chassis - All thru the hole components, no surface mount. Chassis is not too crowded, so servicing should be typical. Solder joints and assembly look to be good, no indications of cheap assembly.
I haven't had them in service too long, so I can't report any long term. But so far they are looking good and I intend on using them again next time I need a 25".