3sk41 Datasheet · Full

If the 3SK41 is hard to procure, several alternatives exist that offer similar RF performance, though they may have different pinouts or packaging: Another high-gain, low-noise N-channel MOSFET.

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The Sansui G‑7500 , a high‑power receiver from the late 1970s, uses a 3SK41 in its front‑end RF amplifier stage. Other classic tuners from brands such as Kenwood, Pioneer, and Marantz also employed the 3SK41 or its close relatives (3SK40, 3SK45) in their FM sections. The Sansui 8080 and 9090 models are particularly well‑known for having tuners that rely on these fragile FETs, and their failure is a common point of failure in these otherwise robust receivers. If the 3SK41 is hard to procure, several

In a typical RF amplifier stage, the Drain of the 3SK41 will be at a positive voltage (e.g., 12–14 V in many Kenwood transceivers), while the Source is near ground potential. A sudden loss of signal, a drop in gain, or excessive noise are often the first signs of a failing 3SK41 in vintage equipment. Other classic tuners from brands such as Kenwood,

According to its datasheet specifications, the 3SK41 was engineered for: