Two Toshiba 12AU7 vacuum tubes, Hi-S type, ideal for vacuum tube amplifiers. - Brand: Toshiba - Model: 12AU7 - Quantity: 2 tubes - Application: For vacuum tube amplifiers - Type: Hi-S These are from an estate and the functionality has not been verified due to the lack of a measuring instrument. They are being sold as-is. Please check the condition in the photos. Please understand and purchase accordingly. These are old items that have been stored at home for a long time. No returns accepted. 6