1990 Miller Syncrowave 500 TIG/Stick Welder | 625A | Complete w/ Coolmate 4

1990 Miller Syncrowave 500 TIG/Stick Welder - Complete Package

Serial Number: LA275250 | Output: 625A Max | Includes Coolmate 4

Overview

The Miller Syncrowave 500 is the ultimate industrial "big-bore" TIG welder. Known for its massive duty cycle and legendary arc stability, this 1990 model is a pure transformer workhorse. Whether you are welding thick-gauge aluminum or running heavy-duty stick electrodes, the Syncrowave 500 delivers a smooth, consistent arc that modern lightweight inverters struggle to match at high amperages.

This is a complete, operational package. It includes the high-capacity Miller Coolmate 4 liquid cooling system, ensuring you can run at high outputs without overheating your torch or internal components.

Key Features

• Massive Output Range: From 25A for precision work up to a staggering 625A for the heaviest industrial applications.
• 100% Duty Cycle: Rated to run 390A at 100% duty cycle, making it capable of non-stop production in demanding shop environments.
• Coolmate 4 Chiller: Includes the heavy-duty Miller Coolmate 4 water cooler, featuring a 4-gallon reservoir and visible flow indicator for maximum torch protection.
• Syncrowave Technology: Features Miller’s famous square-wave technology for superior arc control on aluminum, specifically designed to reduce "arc rectification" issues.
• Industrial Build: At nearly 900 lbs, this machine is built with heavy-copper transformers designed to last for decades, not years.

Included in This Package

• 1990 Miller Syncrowave 500 Power Source (S/N LA275250)
• Miller Coolmate 4 Liquid Cooling System
• Premium TIG Torch (Water-Cooled)
• Foot Pedal (Remote Amperage Control)
• Work Clamp and Leads

Technical Specifications

• Year of Manufacture: 1990
• Input Power: Single-Phase (200/230/460V)
• Max Output: 625 Amps
• Rated Output: 500A @ 40% Duty Cycle / 390A @ 100% Duty Cycle
• Weight: ~887 lbs (Power source only)

Dealer Note

"Finding a 1990 Syncrowave 500 in this condition is a rarity. This was the peak of Miller’s transformer engineering before the industry shifted to lighter, less durable electronics. This unit has been tested and is ready to be put to work immediately. Please note: Due to the weight and power requirements, this machine requires a dedicated 200A circuit for full-output operation and professional rigging for transport."