HiFi Preamp Stereo Amplifier Module Headphone Amp Board Audio Preamplifier Board
HiFi Preamp Stereo Amplifier Module Headphone Amp Board Audio Preamplifier Board Features: HiFi tube amplifier, mellow and plump sound. Eight 470UF capacitor filter, pure power supply system, no hum. RCA (lotus seat) that little hole is not the headphone port, it is the screw holes. Ideal for subwoofer audio conversion or assembly. The circuit design is reasonable, low noise, low power, is a high-quality entry-level electron tube preamplifier circuit. With LEDs on the bottom of the tube, send out soft orange light when it is working. Great for smartphone, computer, CD, DVD, MP3, and other audio equipments. Power works: Turn on the power, tube filament was started heating at this time from the zero voltage boosting, after filament tube heating, voltage boosting was finished. Specifications: Material: Acrylic and PVC S/N: >=90dB Sensitivity:
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