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: RF Amplification, IF Amplification, and RF Mixing. Key Features :
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: Enables easy implementation of AGC or mixing. 2. Technical Specifications and Electrical Characteristics 3sk41 datasheet
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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. : RF Amplification, IF Amplification, and RF Mixing
The circuit uses the 3SK41 as the primary power-switching element.
The 3SK41 is housed in a standard , offering robust RF shielding and thermal dissipation. The typical pin orientation, when looking at the bottom of the transistor lead layout with the alignment tab pointing downwards, is configured as follows: Pin 1: Source (S) & Case grounding. Pin 2: Drain (D) . Pin 3: Gate 2 ( G2cap G sub 2 : Enables easy implementation of AGC or mixing
Gate 1, Gate 2, Source, Drain (often with a 4th lead for the case/shield) Commonly Available Data Sources: Alldatasheet - 3SK41L Veswin 3SK41 Description Utsource 3SK41 Description
When buying replacement stock, look out for the complete markings to ensure you are receiving the low-noise, high-temperature resilient metal-can variant rather than an unrelated standard transistor. If you are troubleshooting a specific circuit, let me know:
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