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Volumes

1. Vol 1 What It Is and Its Place in the Heathkit Line The affordable semiconductor curve tracer that put device fingerprinting on the hobby bench
2. Vol 2 How a Semiconductor Curve Tracer Works Stepped base drive, swept collector supply, and an X-Y plot — the IT-3121 as the worked example
3. Vol 3 Servicing It, and Dave Erickson’s Redesign What breaks on a 40-year-old unit, and how Dave Erickson rebuilt the architecture with a microcontroller
4. Vol 4 Using It: Procedure, Reading Curves and Safety Wire up a scope, and read gain, breakdown, and matched pairs off the glass