Linsoul Xduoo MT-604 Tube + Transistor Hybrid Headphone Amplifier Pre-Amplifier with Four 6J1 Balanced Tubes, Independent L&R Volume Control

Linsoul Xduoo MT-604 Tube + Transistor Hybrid Headphone Amplifier Pre-Amplifier with Four 6J1 Balanced Tubes, Independent L&R Volume Control

Riverstone Audio - Matched Pair (2 Tubes) JAN 5654W Fully-Tested Vacuum Tubes 6J1 / 5654 /6AK5/ EF95 / 6AK5 Tube Replacement