Here's the specs for the eygo 19inch that I've been going by for my advance mame setup up, hope its of some help...
Mine is rotated vertically in a cocktail cab and the games look mint. (Using Advance Mame under pure DOS)
Eygo 19" arcade monitors.
Specs:
Power Supply
Switch mode power supply
Dual AC input range
Jumper selectable
No isolation transformer required
Input Signal
Video - RGB analog, positive, 0.7 Vp-p.
Impedance - 75 ohms, terminated.
Rise Time - less than 25 nanoseconds.
Bandwidth - DC to 25 MHz (at - 3dB), mode 3.
Resolution - Model
1. 640 x 350 (70Hz refresh)
2. 640 x 400 (70Hz refresh)
3. 640 x 480 (60Hz refresh)
Sync. - TTL, positive or negative. Monitor circuitry will
automatically determine and adjust for VGA Horizontal Scan - Frequency 31.5KHz nominal
Capture range-30.5~32.5KHz
Active video - full width display of video
signals with active video from 25 to 28usec.
Linearity - plus or minus 5%
Vertical Scan - Frequency 60/70Hz
Capture range 47~85Hz
Linearity - plus or minus 5%
Picture Size Regulation
2%
Geometric Distortion
plus or minus 1.5% (max)
Environmental Conditions
Temperature 100 ~ 550C
Humidity 10~90%, no condensation
High Voltage
13"=23KV, 20"=25KV, with integral X-radiation
Shut-down protection
Degaussing
Automatic, operating at beginning of each power-up
cycle, provided the monitor has been turned off for
at least 20 minutes.