National 6AV6 Vacuum Tube - Brand: National - Model: 6AV6 - Condition: Unused - Features: Vacuum tube This is a vacuum tube that my grandfather kept. It has been stored in a box, so I think it should work. Please judge the condition from the photos. Since there is no way to check the operation, the operation has not been confirmed. Please purchase with the understanding of this. This product is only a used item, so please refrain from purchasing if you are sensitive to this. Cancellations, returns, and refunds are not accepted for any reason after purchase. Price negotiation is not possible.