Compact vacuum tube amplifier featuring two 6MB8* vacuum tubes, with a mesh protective cover. - Model Name: TU-870 - Input Terminals: 2 systems (INPUT 1, INPUT 2) - Speaker Terminals: Speaker connection terminals - Vacuum Tubes: 2 tubes, 2W x 2 - Design Features: Vacuum tube section with mesh cover - Power Supply: With fuse Thank you for viewing. This is a self-made product from about 20 years ago. The volume control has no scratchiness, and its operation has been confirmed. Although the output is low, it's just right for normal listening. The vacuum tubes have been replaced once. There is an assembly manual and parts list, so repairs are possible if needed. The softly glowing vacuum tubes are also great for interior decoration. Specifications are in the circuit diagram image.