Lectronics – 221034‑102 (FAB 220959 Rev B) – Spectrum Interface PCB for System 4

The Lectronics 221034‑102 (FAB 220959 Rev B) is a specialized interface PCB designed for legacy System 4 drilling instrumentation. Serving as the spectrum interface board, it bridges analog/digital acquisition modules with depth and signal logging systems. This U.S.-made board is commonly available as new-old-stock or lightly used.

Key Features:

• Model: 221034‑102 (FAB 220959 Rev B)  

• Function: Spectrum interface PCB for System 4 control modules

• Revisions: Marked “FAB 220959 Rev B”  

• Format: PCB assembly weighing approximately 230 g; U.S.-manufactured  

• Condition: Available as “new – open box” or used/pulled units  

• Compatibility: Tailored for M/D Totco System 4 electronics—fits analog/digital acquisition racks and spectrum modules