This is a vacuum tube amplifier purchased from Sunvalley Audio over 10 years ago. I haven't been able to confirm that it produces sound, but the last time I checked, sound wasn't coming from one of the speakers. Please consider this a junk item. I would be happy if someone who enjoys disassembling and repairing things could get it working again. The vacuum tube on the V1 side is burnt out. The metal parts have rust. It's an amplifier from the stylish barrel amp series, and since it's no longer sold, it's a rare item even in the used market. Vacuum tube amplifier DIY Tube Triode triode