Description
Premium 45W+45W High-Fidelity Stereo Amplifier Module
The STK4181V 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 45 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 STK4181V is the definitive replacement part for high-end vintage receivers and integrated stereo amplifiers that demand high output without sacrificing clarity or detail. It provides a more precise and detailed soundstage compared to the standard Series II variants.
Key Technical Features:
- Continuous Power Output: 45W + 45W (at 8Ω, 20Hz to 20kHz, THD = 0.08%).
- High-Fidelity Performance: 0.08% THD for transparent, studio-quality sound.
- 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 ±34V (Absolute Maximum ±51V).
- Pin Compatibility: Member of the STK4101V series (15W to 50W) and pin-compatible with the STK4102II series.
Installation & Technician's Notes:
The STK4181V generates significant thermal energy during operation. 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 diagnostic test—will result in immediate and permanent internal failure.
Pro Tip: Before installation, verify that your power supply rails are symmetrical and discharge all filter capacitors. We highly recommend checking the 0.22Ω to 0.47Ω output emitter resistors, as these often fail when the original module shorts out.