Agilent Technologies G1946-65251 Octopole Ion Guide

The Agilent G1946-65251 Octopole Ion Guide is a replacement Octopole 2 driver printed circuit assembly for the octopole portion of Agilent’s G1946‑series ion optics used in LC/MS systems. Referred to in catalogs as the Tstd Octopole 2 PCA, this board provides the second octopole driver circuitry that powers the eight-rod ion guide housed in the ORS cell, enabling stable ion transmission from the source to the mass analyzer under Agilent instrument configurations. The part number G1946‑65251 is documented as compatible with G1946A/B/C/D configurations and is backwards compatible with the G1946x family, supporting technicians during service and repair when a like-for-like replacement is required. As a genuine Agilent replacement PCA, it is designed for instrument-maintenance workflows by trained personnel, helping preserve consistent ion optics behavior and instrument performance over time. Typical applications include replacement of a failed or degraded Octopole 2 driver board in G1946-enabled LC/MS systems, where the octopole stage forms part of the ion path that guides ions through the ORS into the quadrupole or time-of-flight analyzer.