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Since the 3SK41 is discontinued, you have three options:
The original 3SK41 datasheet highlights it as an ideal choice for electronic tuners in TVs and VCRs, as well as FM radio front-ends. 3sk41 datasheet
This is where the dual-gate MOSFET shines. The gain is controlled by varying VG2. Since the 3SK41 is discontinued, you have three
Summary: the 3SK41 is an N‑channel dual‑gate MOSFET (small RF/low‑power device in a CAN/TO‑style metal can) used historically in VHF/UHF tuner and RF front‑end circuits. Below I break down what a datasheet for this part usually contains, explain the key specs, show how they affect circuit behavior, give practical tips for selection, testing, PCB layout and replacement/cross‑reference, and include simple application examples. This is where the dual-gate MOSFET shines