<b>6N3 Stereo Preamplifier for Home Audio Speakers</b><br> When the output signal of the audio source is insufficient or the input sensitivity of active speakers and power amplifier is too low, the sound effect will be bad. After adding this preamplifier, unpleasant digital sound of audio sources will be filtered out. Music will be softer stronger and more beautiful. <br> 1. RCA/AUX/USB signal inputs<br> 2. With DAC function<br> 3. 6N3 tubes<br> 4. USB chip CM6653, 24Bit/ 96 kHz<br> 5. Inside USB sound card for better sound effect for computer<br> 6. Aluminum alloy shell<br> 7. Bass/ treble/ volume adjustment knobs, high playability<br> 8. Low noise, low distortion, reduce interference<br><br> <b>Technical Specs:</b><br> Chipset: 6N3 USB DAC CM6653 (24Bit / 96kHz)<br> Interface Input: PC-USB, RCA, AUX<br> Interface Output: RCA<br> THD: 0.02%<br> SNR: -110dB<br> Frequency Response: ±2 (20Hz-20kHz)<br> Operated: Toggle Switch and Front Panel Volume Control, Bass /Treble<br> Power Supply: DC 12V 1.66A<br> Color: Black/Silver<br> Unit Weight: 0.56kg<br> Unit Size: 13x 14 x 7.5cm<br><br> <b>Replaceable 6N3 Tubes</b><br> This audio preamp uses 6N3 tubes, which can be replaced with 6H3П, 6A8Q, 2C51, ECC42, GE5670, WE396A tubes. Give you dynamic, sweet, soft and warm tube sound enjoyment. Different tubes has different different feelings. The vacuum tube preamplifier also has DAC function.<br><br> <b>RCA/ USB/ AUX Inputs</b><br> This mini preamp has three input modes: RCA, USB, and AUX. Can connect to most audio devices with USB, RCA, AUX output devices, such as mobile phones, computers, tablets, DVD, MP3/4, TV, etc.<br><br> <b>USB Chip CM6653/ Sound Card</b><br> The USB chip uses CM6653. Sampling rate is 24Bit/96kHz. The function of the built-in USB sound card is to improve the sound quality of the computer sound card. Connecting to a computer to play music has better dynamic and sweet sound quality.<br><br>