This listing is for a pair of 6SN7GTB tubes manufactured by RCA. The tubes have black plates and are considered new old stock (NOS). They have been tested and are in good working condition. These tubes are suitable for use in vintage electronics, particularly in audio and video equipment. The brand, model, and country/region of manufacture are all specified in the aspects section. This is a custom bundle with no modifications made to the tubes. Consider adding these RCA 6SN7GTB tubes to your collection or for use in your vintage electronics projects.