This is a vacuum tube hybrid amplifier purchased about 15 years ago on Yahoo Auctions. It was a self-made product by the seller, and the purchase price was around 65,000 yen. I haven't used it recently, and when I turned it on after a long time, there was no sound from the left side. The power turns on, and the vacuum tubes and LEDs light up. I've kept it indoors with air conditioning since I bought it, so it should have been in good condition, but I don't know the cause. The sound quality was very clear, with high resolution in each frequency range, and it was a good amplifier that also had the warmth of a vacuum tube, but I don't know how to use a tester, so I've decided that I can't fix it and am listing it for sale. For the above reasons, I am selling it as junk. I would appreciate it if someone who knows more about it or can repair it themselves would take it. There are no circuit diagrams or accessories. The seller is still selling self-made audio equipment and has over 1000 positive reviews, but I couldn't contact them because it's been a long time since I purchased it. External Dimensions w300 x d200 x h110mm Weight 3.6kg