This is a super-mint condition item, only used for listening. Previously, I was surprised by how good the sound was from a Chinese digital amplifier I bought for fun, so I decided to try a tube amplifier and bought this one, which was ranked #1 on Amazon. Immediately after buying it, I upgraded the vacuum tubes to (US-made GE JAN 5654W vacuum tubes, military-grade selected). It's true that this amplifier deserves its #1 ranking. (There's a reason why things sell well. Old-fashioned people like me tend to choose based on brand names, so I'm often prejudiced against brands I've never heard of.) However, since it's not a major setup, and I don't want to dismantle my current audio system, I'm putting it up for sale. It's only been used for listening, so there's no damage or dirt. It's in like-new condition as shown in the photos. The current Amazon price, including the upgraded vacuum tubes, is 16,000 yen. The original Chinese vacuum tubes are not included. No claims accepted. AIYIMA T9 Bluetooth 5.0 100W*2 Tube Amplifier 2.0 Channel Vacuum Tube USB DAC Stereo HiFi Home Audio Digital Amplifier RCA/COA/Opt/PC-USB, with VU Meter The AIYIMA T9 amplifier with vacuum tubes features a VU meter and offers various connection options. - Brand: AIYIMA - Model: T9 - Connection Types: PC/USB, AUX, RCA - Power Supply: DC18-30V - Features: VU Meter, Vacuum Tubes Thank you for viewing.