This is a vacuum tube preamplifier. I'm selling it because I'm reorganizing my speakers and haven't used this amp much. Final operation check completed before listing. Everything in image 1 is included. I think it's also good as a base model for tube rolling. The vacuum tube is 6K4. If you need the original box (image 6), I will change the shipping to Takkyubin (home delivery service) for an additional 230 yen. I will change the price, so please comment before purchasing. *No returns accepted.