HISTORICAL PROVENANCE & CONDITION STATEMENT: This custom diagnostic fixture was pulled directly from the active production line and verified in full working order upon the official factory closure in 2020. It went straight from live technician use into climate-controlled storage, ensuring all internal components, switches, contacts, and circuits remain in pristine, unaltered condition. This is untested since brought home 2 weeks ago from original storage facility.
Guaranteed fully operational up to the day of factory closure.
ITEM OVERVIEW: Up for auction is an incredibly unique, engineering-grade bench tool direct from the Sweet Home, Oregon production lines: an authentic White's Electronics J113 Field Effect Transistor (JFET) Matching and Calibration Station (Internal Factory Model PT-2025).
The J113 transistor is a foundational component used in metal detector pre-amplifier circuits to boost minute signals from deep gold, silver, and relics. Because off-the-shelf transistors have slight variations, White's engineers built this custom station to manually test, grade, and pair perfectly matched transistors. This step ensured maximum target depth and rock-solid threshold stability for consumer machines before they rolled off the line.
FEATURES & COMPONENTS INCLUDED: Factory Pinout Test Grid: Features an integrated component dock mapped out with an official factory technical pinout schematic label detailing G (Gate), S (Source), and D (Drain) paths.
Master Power & Isolation Interface: Equipped with a physical heavy-duty industrial ON / OFF toggle power interface.
Authentic Technician Warnings: Panel features original factory labeling reading "CALIBRATION NOT REQUIRED" and "TURN OFF BATTERY-POWERED," alongside handwritten engineering shorthand documenting transistor voltage thresholds.
SELLING TERMS: Sold as a standalone premium factory calibration asset. This is an exceptional find for advanced electrical engineering hobbyists, DIY metal detector designers on forums like Geotech, or elite collectors of White's manufacturing legacy.
Item will be packed with extreme care and shipped securely with tracking. Buyer pays actual shipping costs calculated by location.