Description
Elite 50W+50W Audiophile Stereo Power Amplifier Module (22-Pin)
The STK4191X is the master-grade flagship of Sanyo’s thick-film hybrid series. While standard modules in this family offer 0.4% distortion, the "X" (Series 10) is engineered for absolute sonic purity, achieving an ultra-low Total Harmonic Distortion (THD) of just 0.02%. This 22-pin module is the definitive choice for high-end vintage Japanese receivers and studio-grade integrated amplifiers.
Featuring a sophisticated internal current mirror and cascode stage, the STK4191X provides a silent noise floor and transparent soundstage that rivals discrete transistor designs. This is a rare, high-performance component intended for "no-compromise" audio restorations.
Key Technical Features:
- Continuous Power Output: 50W + 50W (at 8Ω, 20Hz to 20kHz, THD = 0.02%).
- Reference-Grade Distortion: 0.02% THD provides studio-quality transparency.
- Specialized Package: 22-Pin SIP (Single In-line Package) for enhanced mechanical stability.
- Internal Muting: Built-in circuitry to prevent power-on/off speaker "thump."
- Operating Voltage: Recommended supply of ±35.5V (Absolute Maximum ±54V).
- Thermal Excellence: Optimized substrate bonding for high reliability at 50W per channel.
Installation & Compatibility Note:
Please Note: This is the 22-pin version of the STK4191. It is designed for specific high-end PCB layouts and is not a direct physical drop-in for standard 18-pin boards without modification.
Due to the high-precision architecture of the STK4191X, it must be securely mounted to a high-mass heatsink with premium thermal grease. Operating this module without a heatsink—even for a few seconds—will cause immediate and permanent internal substrate failure.
Technician's Tip: Before installation, check for symmetrical power rails and verify that your output emitter resistors are intact. For the best performance from this Series X chip, ensure your filter capacitors are in peak condition to maintain the 0.02% distortion spec.