These are vintage valves, with the model number ECC35, is a great addition to any collection of audio equipment. The valves are from the brands Mullard, and were manufactured in the United Kingdom. They are suitable for use in vacuum tubes and are sure to add a touch of vintage sound to your equipment. The valves are sold without any manufacturer warranty, but are still a valuable addition to any collection. They are perfect for use in vintage parts and accessories and are sure to impress any collector. Don't miss out on this opportunity to own a piece of audio history.