This listing is for a set of vintage Marconi 6sf7 radio tubes, new old stock (NOS) and made in Canada. These tubes are perfect for restoring vintage audio equipment or for use in DIY projects. The Marconi brand is known for producing high-quality tubes, and the 6sf7 type is a reliable and versatile option. These tubes are in excellent condition and have not been used, making them a great find for collectors and enthusiasts. Don't miss out on the chance to add these rare and valuable tubes to your collection.