Mitsubishi C-3919: Difference between revisions

Revision as of 02:15, 26 February 2026

The Mitsubishi C-3919 is a 19-inch professional color display monitor manufactured by Mitsubishi Electric for use with the Advanced Electronics Design (AED) 512 and 767 Color Graphics Terminals. It features an in-line gun shadow mask CRT with self-convergence technology.

Photos

Variants

C-3919N — NTSC/North American version (AC120V, 60Hz only)

Features

The C-3919 is designed for high-resolution graphics display, capable of showing up to 2000 characters or 441,600 pixels (768×575 maximum resolution). Key features include:

Self-convergence design requiring no electrical convergence adjustments
Switchable 75Ω / high-impedance input termination for daisy-chaining multiple monitors
Loop-through outputs for daisy-chaining to additional monitors
Separate RGB and sync termination switches
Anti-spark circuit protection
Stable convergence with less than 0.5mm deviation in the center and 0.8mm elsewhere
Video amplifier frequency response of ±3dB from 50Hz to 20MHz
Rise and fall times shorter than 20ns
Warm-up time of 20 minutes maximum

The monitor accepts RGBHV via 5 BNC connectors, supporting either composite sync (CSYNC) on the HD input alone, or separate horizontal and vertical sync using both HD and VD inputs.

Specifications

Video input levels: 0.7–1.5 Vp-p for RGB, 1.0–5.0 Vp-p for sync
Blanking time: Horizontal <9.5μs, Vertical <0.8μs
Raster size regulation: <4mm change with 0–200μA beam current
Linearity: Better than ±7%
Raster distortion: Less than 2% of raster height

TVL derivation

The 576 TVL figure is derived from the maximum horizontal resolution supported by the AED 512/767 graphics terminals that drove these monitors. Per the AED users manual, the highest resolution raster mode is 768×575 pixels.

Since TVL (TV lines) measures horizontal resolution across picture height, the horizontal pixel count must be adjusted for aspect ratio. For a 4:3 display:

768 pixels × (3 ÷ 4) = 576 TVL (addressable)

This represents the theoretical addressable resolution. Effective resolution with real-world content would be lower depending on the Kell factor applied (typically 0.7 for interlaced content, ~0.85 for progressive/static graphics).

Note that the monitor's 20 MHz video bandwidth (±3dB) could theoretically support significantly higher resolution — the raster addressing of the AED terminal is the limiting factor, not the monitor's analog circuitry.

@@ Line 54: / Line 54: @@
 * '''Linearity:''' Better than ±7%
 * '''Raster distortion:''' Less than 2% of raster height
+== TVL derivation ==
+The 576 TVL figure is derived from the maximum horizontal resolution supported by the AED 512/767 graphics terminals that drove these monitors. Per the AED users manual, the highest resolution raster mode is 768×575 pixels.
+Since TVL (TV lines) measures horizontal resolution across picture height, the horizontal pixel count must be adjusted for aspect ratio. For a 4:3 display:
+: 768 pixels × (3 ÷ 4) = '''576 TVL''' (addressable)
+This represents the theoretical addressable resolution. Effective resolution with real-world content would be lower depending on the Kell factor applied (typically 0.7 for interlaced content, ~0.85 for progressive/static graphics).
+Note that the monitor's 20 MHz video bandwidth (±3dB) could theoretically support significantly higher resolution — the raster addressing of the AED terminal is the limiting factor, not the monitor's analog circuitry.
 {{CRT voltage range