This is a vacuum tube that my grandfather used. It's been stored in a box, so I think it's usable. Please judge the condition from the photos. Since I don't have a way to test it, its operation has not been confirmed. Please purchase with the understanding of this. This item is a used item, so please refrain from purchasing if you are sensitive to such things. Cancellations, returns, and refunds are not accepted for any reason after purchase. Price negotiation is not possible.