Unable to power on?

• Ensure a stable electrical environment.
• Confirm all are plugged correctly.
• Make sure to replace the power supply and socket.
• Ensure that correctly power on the machine.
• If it is a tube preamp, re-seat the tubes, switch them, try a spare pair of tubes.
• Please refer to the video through the link. https://youtu.be/9bObE2Z24Eg (1:33 Preamp)

If you have any questions or concerns, please don't hesitate to contact support@fosiaudio.com.