9. Vacuum‑Tube Replacement Instructions

After prolonged use,if vacuum tubes become aged or damaged, they should be replaced. Please follow the steps below:

1. Before replacing the vacuum tubes, please power off the device and disconnect the power cable and all audio cables. Let the device sit for 30 minutes to allow the tubes to cool down and avoid the risk of electric shocks or burns.

2. Use the screwdriver included in the accessory kit to remove the screws securing the top cover of the device, as shown below.

3. Lift the top cover vertically and place it in a safe area. Now the tube replacement can proceed.

4. Carefully pull the vacuum tube to be replaced straight up. Do not apply excessive force or bump the protective wall of the tube, as this may damage the tube and cause injury from broken glass.

5. Align the locating pins of the new vacuum tube with the alignment notches, and then insertit downward vertically. Ensure the new tube is inserted in place and level with the other of the same type.

6. Once the replacement is completed,carefully lower the top cover vertically over the tubes and re-tighten the screws.Reconnect the cables as shown in the connection diagram and continue enjoying your music.

Important Warnings

‑ Power off, disconnect all cables and wait 30 minutes for tube cooling before replacement to avoid electric shock or burns.

‑ Do not apply excessive force or strike tube guards; broken vacuum‑tube glass may cause cuts.

‑ Ensure replacement tubes are fully seated and flush with tubes of identical model.

‑ When refitting the top cover, keep fingers away from the seam between top cover and base chassis to prevent pinching injuries.