![](https://ae04.alicdn.com/kf/H97334fa2b9db4ea4818d446ca53e766fa.jpg)
Specifications:
Product name: Tube Preamplifier
PC-USB supports sampling rate: 192K/24Bit
Distortion: RCA: 0.2%/HP: 0.003%
PC-USB support operating system: XP/W7/W8/W10/MAC/linux
Signal to noise ratio: RCA: 108dB/HP: 106dB
Headphone impedance matching: 16-300¥Ø
Working voltage: DC12V
Replacement tube:GE5657, 396A, 2c51, 12BA4, 5670, 6H3n)
Maximum output power: RCA: 1.9V/HP: 120mW@32¥Ø
Headphone amplifier chip: MAX9722
Bluetooth chip: QCC3031 Bluetooth 5.0 version, supports Qualcomm aptX and aptX HD audio
Operational amplifier chip: OPA1656
Decoding chip: ES9018K2M+SA9123L
Input sensitivity: 2V
Frequency response: 20Hz-20kHz (±0.5dB)
Audio input: Bluetooth/ USB/ Optical/ Coaxial/ RCA
Audio output: 3.5mm Headphone output/ RCA(Active speaker / Amplifiers)
Size: 138*123*51MM
Steps:
1. Connect the audio source to be used to the audio source input interface (when connecting to Bluetooth, the input channel must be switched to Bluetooth input)
2. Connect the downstream equipment that needs to be connected to the audio output interface (such as power amplifier, active speakers, etc.)
3. Connect the power supply (DC voltage must not be higher than 12V)
4. Press the encoder knob to turn on
5. Short press the knob to switch to the corresponding input channel to be used
6. Turn the knob clockwise to select the desired volume
PC-USB operating instructions:
1. Use the factory-configured USB cable to connect the PC-USB interface of this machine to the computer (USB supports hot swapping).
2. Press the encoder knob to switch to PC-USB input.
3. As shown in the figure, find the icon with the horn symbol in the lower right corner of the PC.
4. Right-click the pop-up dialog box, and click [Play Device].
5. In the pop-up dialog box, select the USB device recognized by the PC (this machine automatically recognizes the USB, no manual driver installation is required).
6. Click to confirm the recognized digital output and set it as default.
Note:
1. Do not open the shell privately. Improper operation may damage the machine or cause the risk of electric shock.
2. Please use a switching power supply produced by a regular manufacturer, otherwise there is a risk of damage to the machine.
3. Do not change the tube at will, otherwise it will burn out your tube or machine.
4. Do not put the machine in high temperature or humid environment to work.
Package included:
1* T8 tube Tube Preamplifier
1*Power Supply(Optional)
![](https://ae04.alicdn.com/kf/H04490937e0db423781dd38e251317eaaK.jpg)