3sk41 Datasheet -

If you're restoring a vintage radio or building a high-fidelity RF front end, the 3SK41 datasheet is a must-read for its precise pinout and voltage ratings.

Used in VCO (Voltage-Controlled Oscillator) and PLL (Phase-Locked Loop) circuits. Security & Signal Systems: 3sk41 datasheet

The dual-gate structure allows for superior gain control (AGC) and high stability by reducing the internal capacitance between the drain and the primary gate. www.jotrin.ru The "Deep Story": A Relic of the Analog Era If you're restoring a vintage radio or building

The 3SK41 is a silicon N-channel dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) produced primarily by Hitachi (now Renesas) and later by NEC. Unlike a standard JFET or single-gate MOSFET, the dual-gate architecture offers a unique advantage: it combines the low-noise characteristics of a JFET with the automatic gain control (AGC) capability of a bipolar transistor. A multimeter in diode mode will not test it properly

Because the 3SK41 is a depletion-mode MOSFET, it is "normally on" with VGS=0V. A multimeter in diode mode will not test it properly. Here is how to test from the suggestions:

The is a classic N-channel dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) that has long been a staple in high-frequency applications . Primarily designed for VHF (Very High Frequency) amplifiers and mixers, it remains a point of interest for hobbyists, vintage radio restorers, and engineers working with legacy RF circuits.