Used 6V6GT tubes. Usage time is unknown. This is a set of two, but they are not matched pairs. Functionality has been confirmed by inserting them into an amplifier. Will be shipped in simple packaging. --- - The following is a Mercari AI-generated description - GE 6V6GT vacuum tubes, made in the USA, ideal for audio equipment. - Brand: GE - Model: 6V6GT - Type: Vacuum tube - Country of Manufacture: USA Thank you for viewing.