Sanyo STK, commonly known as Sanyo thick film, is not a level that ordinary amateur DIY players can achieve, thanks to its tuned sound and high-precision semiconductor process control. Besides better soundstage and resolution, its low-frequency dynamics are significantly stronger, completely distinguishing it from ordinary players and professional athletes! These thick film circuits have always been customized products specifically for major brand audio manufacturers. In the early days, many renowned factories used them to manufacture power amplifiers, such as K+H, Sony, Panasonic, Kenwood, JVC, Sansui, Sharp, Pioneer, and Aiwa, almost all of which are Japanese audio manufacturers. They have been used for over two decades, influencing an entire generation, and also the sound with a strong imprint of the era that our entire generation heard when we were young. It is unforgettable every time we listen to it. The company specializing in the production of power amplifier modules was later acquired by ON Semiconductor, which integrated Sanyo's traditional craftsmanship with ON's unique design, resulting in even more impressive products. These products are still adopted by major American companies such as Bose, and European companies like Genelec!
Fortunately, I encountered a batch of brand new inventory of the STK404-120 amplifier module produced by Sanyo SANY0 company in the later stage. This series has many product models, including STK404-050-140. Among them, STK404-120 is a relatively high-power model. This series of products is produced in the later stage, using typical classic circuits with simple circuits and compact packaging. The voice expression is impressive. Design output power 80W@6 Oh, distortion THD 0.4%. Pushing general bookshelves or floor standing speakers can achieve satisfactory results. This thick film chip was only supplied to manufacturers of complete machines at that time, so it was relatively difficult to see on the market.
This power amplifier board is designed with a high-performance concept in mind, featuring solder-free connections for hassle-free installation. The materials used are carefully selected, and the power amplifier module can be installed either lying flat or upright. With a suitable heat sink, it is relatively easy to achieve multi-channel functionality.
Sound performance: The overall tone is warm, the sound is relatively soft, the treble extends high without being harsh, the bass is deep and has good elasticity, without being muddy or dragging. The Sanyo thick film is a circuit that falls between integrated and discrete power amplifiers. Its fine craftsmanship and excellent technology surpass that of 3886 and 7294, and it is difficult for general DIY enthusiasts to achieve this level.
Supply voltage: AC dual 29-45V
Output power：80W@6 Ω
PCB size: 72 wide X45 high X125 long
Weight: 0.15KG
