Set of 2 Toshiba 5751 vacuum tubes, ideal for audio equipment. - Brand: Toshiba - Model: 5751 12AX7 - Quantity: Set of 2 - Type: Vacuum tube These are from an estate and their operation has not been verified as I do not have 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. 16