FAQ

• Q

  How to install a vacuum tube? (I can't install the vacuum tube, or I don't know how.)

  A

  Vacuum tubes do not distinguish between left and right.

  Lay the machine flat, hold it down with one hand, and hold the vacuum tube with the other.

  Align the pins, wiggle left and right, then press down firmly into place.

• Q

  The machine won't turn on / How do I turn it on? There's no response after plugging in the power; I'm unsure how to turn it on.

  A

  Check that the power supply is properly connected and powered on.

  Most models power on by a short press of the knob or button (not a long press).

  Some models require a remote control to power on (AAA batteries are needed).

• Q

  How do I search for and connect to Bluetooth devices? I can't find or connect to Bluetooth devices, or I don't know how to connect.

  A

  First, switch to Bluetooth mode (BT light flashes).

  Search for names like "BT Hifi Audio" or "SUCA AUDIO" on your mobile phone.

  After clicking the connection button, the BT light will stay on. You can then play music on your phone.

• Q

  How to install vacuum tubes? I can't install the vacuum tubes, or I don't know how.

  A

  Vacuum tubes do not distinguish between left and right.

  Lay the machine flat, hold it down with one hand, and hold the vacuum tube with the other.

  Align the pins, wiggle left and right, then press down firmly into place.

• Q

  No sound / How do I adjust the volume? All connections are correct, but there's still no sound.

  A

  Confirm product type: Tube preamps need to be connected to power amplifiers or active speakers; they cannot be directly connected to passive speakers.

  Adjust the volume by long-pressing or rotating the volume buttons (the exact steps may vary slightly depending on the model).

  You can also adjust the volume using the remote control.

  Note that the low, mid, and high frequency knobs need to be adjusted to the appropriate positions.

• Q

  USB flash drive/TF card cannot be recognized or switched to the correct mode. The machine does not recognize the USB flash drive or TF card or cannot switch to the correct mode.

  A

  Only supports FAT32 format, 64GB and below.

  Supports music formats such as MP3, WAV, APE, and WMA.

  It is recommended to put music directly in the root directory, without creating folders.

  Music files should not be too large (ideally under 50MB, with a sampling rate of 48kHz/16bit or less).

• Q

  The remote control is not working or is not sensitive. The remote control does not respond when the buttons are pressed, or it works intermittently.

  A

  Batteries are not included with the product; you will need to install two AAA batteries yourself.

  The infrared remote control must be pointed directly at the machine's IR receiver window, without any obstruction or large angular deviation.

  Note that other electrical appliances or light sources may cause interference.

• Q

  Bluetooth connection may experience static/noise/stuttering. When playing music via Bluetooth, the sound may be intermittent or have static.

  A

  Check if the Bluetooth antenna is tightened properly.

  Avoid proximity to electrical appliances such as WiFi routers, refrigerators, fans, and air conditioners for interference.

  Bluetooth range is recommended to be within 10 meters, and obstruction should be avoided as much as possible.

  
  

• Q

  Headphone jack issues (no sound on one side/background noise/current noise): After plugging in headphones, there is no sound on one side, or there is noticeable background noise.

  A

  Please confirm whether the headphone plug has 3 prongs (without microphone) or 4 prongs (with microphone). 4 prongs may cause malfunctions.

  Low-impedance, high-sensitivity headphones tend to have more noticeable background noise. It is recommended to add an impedance rod (with a resistance value close to that of the headphones, such as adding a 30-50Ω rod to 32Ω headphones).

  The recommended headphone impedance is between 32-300Ω.

  
  

• Q

  Fiber/coaxial cable has no sound or abnormal sound. I connected the fiber/coaxial cable to the TV or player, but there was no sound.

  A

  The output mode needs to be manually set on the playback device; it is not plug-and-play.

  For televisions, select SPDIF/optical or coaxial output, and choose PCM signal mode.

  This device supports up to PCM/192kHz and does not support direct output of DSD source code.