Mitsubishi C-3419: Difference between revisions

Latest revision as of 02:19, 26 February 2026

The Mitsubishi C-3419 is a 13-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.

Variants

C-3419N — NTSC/North American version (AC120V, 60Hz only)

Features

The C-3419 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 AED 512/767 graphics terminals that typically drove these monitors. Per the AED users manual, the highest resolution raster mode is 768×575 pixels. Since TVL measures horizontal resolution across picture height, the pixel count is adjusted for 4:3 aspect ratio:

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

Could the monitor resolve more with a different source?

The monitor's video bandwidth is specified at 20 MHz (±3dB). This represents how fast the video amplifier can switch the electron beam intensity. At the maximum 24 kHz horizontal scan rate, each line is ~41.7 µs, with ~32 µs of active video (after blanking). A rough estimate:

32 µs × 20 MHz = ~640 cycles (line pairs) per line

Applying real-world factors (the -3dB spec means signal is already attenuated ~30% at that frequency), practical resolution from the electronics might be 500–600 pixels horizontally — which aligns reasonably well with the 768-pixel AED mode.

Unknowns:

The shadow mask pitch is not specified in the AED manual. Without knowing the phosphor dot spacing, we cannot determine whether the video amplifier or the shadow mask is the true resolution bottleneck. The 576 TVL figure should be considered an estimate based on the AED system configuration, not a definitive monitor specification.

@@ Line 50: / Line 50: @@
 == 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.
+The 576 TVL figure is derived from the AED 512/767 graphics terminals that typically drove these monitors. Per the AED users manual, the highest resolution raster mode is 768×575 pixels. Since TVL measures horizontal resolution across picture height, the pixel count is adjusted for 4:3 aspect ratio:
-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)
-: 768 pixels × (3 ÷ 4) = '''576 TVL''' (addressable)
+'''Could the monitor resolve more with a different source?'''
+The monitor's video bandwidth is specified at 20 MHz (±3dB). This represents how fast the video amplifier can switch the electron beam intensity. At the maximum 24 kHz horizontal scan rate, each line is ~41.7 µs, with ~32 µs of active video (after blanking). A rough estimate:
+: 32 µs × 20 MHz = ~640 cycles (line pairs) per line
+Applying real-world factors (the -3dB spec means signal is already attenuated ~30% at that frequency), practical resolution from the electronics might be 500–600 pixels horizontally — which aligns reasonably well with the 768-pixel AED mode.
-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).
+'''Unknowns:'''
-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.
+The shadow mask pitch is not specified in the AED manual. Without knowing the phosphor dot spacing, we cannot determine whether the video amplifier or the shadow mask is the true resolution bottleneck. The 576 TVL figure should be considered an estimate based on the AED system configuration, not a definitive monitor specification.
 {{CRT voltage range