Description
High-Output 150W Mono Power Amplifier Module
The STK4048II is a powerhouse thick-film hybrid integrated circuit from Sanyo. As one of the highest-rated modules in the 40xx series, it delivers a massive 150 Watts of continuous power. This mono module is the industry-standard replacement for flagship vintage stereo receivers, high-power subwoofers, and professional stage monitoring equipment.
The "Series II" design is engineered for heavy-duty reliability, featuring a built-in constant-current circuit that significantly reduces power-on and power-off "thump" or shock noise, protecting your high-end speaker drivers.
Key Technical Features:
- Continuous Power Output: 150W Minimum (at 8Ω, 20Hz to 20kHz, THD = 0.4%).
- Configuration: Mono (Single Channel) in an 18-pin SIP package.
- Distortion: 0.4% THD at full power; 0.3% THD at 1.0W (1kHz).
- Frequency Response: Ultra-wide bandwidth from 20Hz to 50kHz.
- Operating Voltage: Recommended supply of ±59V (Absolute Maximum ±87V).
- Versatility: Member of a pin-compatible series (120W to 200W), allowing for flexible design and repairs.
Technician's Installation Guide:
Due to the 150W output rating, the STK4048II generates significant thermal energy. It must be mounted to a heavy-duty heatsink using high-grade thermal compound. Ensure that your power supply filter capacitors are fully discharged before installation, as the high rail voltages (up to ±87V) can be lethal to both the technician and the new IC.
Safety Note: We recommend checking the output protection relay and emitter resistors before powering up, as a previous failure in the speaker lines often damages these components along with the original IC.