The product is a vintage Ken-Rad 6V6-GT/G VT-107-A vacuum tube, made in the United States. It has a classic black glass design and has been tested to ensure functionality. This item is a sought-after piece for collectors of vintage electronics and consumer electronics enthusiasts. The Ken-Rad brand is known for its quality products, making this vacuum tube a valuable addition to any collection.
From dad's huge collection of tubes, where he tested most and labeled them on white box in first picture (usually).