EICO Flyback Transformer and Yoke Tester Model 944

Circa 1954

A specialized diagnostic tool used to test high-voltage components in older television sets using cathode-ray tube (CRT) technology.

Use Cases:

This device was a standard bench tool for television repair technicians during the mid-20th century. Its primary function is to identify faults in the horizontal deflection system of a TV:

• Flyback Transformer Testing: It checks for shorted turns and continuity in flyback (LOPT) transformers, which are critical for generating the high voltage needed for the CRT display.

• Yoke Testing: It evaluates the integrity of horizontal and vertical deflection yokes.

• Continuity & Short Detection: The "Selector" switch allows technicians to specifically isolate whether a component has an internal short or a break in its windings.

• In-Circuit Capability: It was designed to test these components while they were still in the television chassis, significantly speeding up the troubleshooting process for repair shops.

Historical Significance:

The Model 944 is historically significant for bringing high-speed diagnostic capability to the local TV repairman. Before such testers, diagnosing a failed flyback transformer often required "substitution"—swapping in a known good part—which was expensive and time-consuming. As part of EICO's popular line of DIY kits, it also empowered many hobbyists and students to build their own professional-grade lab equipment at a lower cost than pre-wired units from competitors.

(H-20cm x W-12.7cm x D-12cm)