Description
Premium 50W+50W High-Fidelity Stereo Amplifier Module
The STK4191V is a high-performance thick-film hybrid integrated circuit from Sanyo's prestigious "V" series. Engineered for superior sonic transparency, this module delivers a continuous 50 Watts per channel into 8 ohms. The "V" series revision incorporates an advanced internal current mirror circuit that achieves a remarkably low Total Harmonic Distortion (THD) of just 0.08%.
A favorite among audiophile restorers, the STK4191V is the definitive replacement part for high-end vintage receivers and integrated stereo amplifiers that demand high output without sacrificing clarity or detail.
Key Technical Features:
- Continuous Power Output: 50W + 50W (at 8Ω, 20Hz to 20kHz, THD = 0.08%).
- Distortion Performance: Ultra-low 0.08% THD for professional-level audio fidelity.
- Built-in Muting: Integrated muting circuit to eliminate power-on/off "pop" noise.
- Frequency Response: Full-range reproduction from 20Hz to 50kHz.
- Operating Voltage: Recommended supply of ±35.5V (Absolute Maximum ±53V).
- Thermal Advantage: Guaranteed operation up to 125°C substrate temperature for enhanced reliability.
Installation & Technician's Notes:
The STK4191V generates significant thermal energy during high-volume playback. It must be securely mounted to a large, flat heatsink using high-quality thermal silicone grease. Because the internal transistors are bonded directly to the substrate, operating the module without a heatsink—even for a brief test—will result in immediate and permanent internal failure.
Technician's Note: Before installing, verify that your power supply rails are symmetrical and ideally near ±35.5V. Check the output emitter resistors and protection circuitry for damage, as a short in the speaker lines is the most common cause of the original module's failure.