GT-6V6-C Duet Classically designed with warm overdrive and soft distortion character. Chinese made copy of the old USA 6V6 used in old Deluxe Reverbs. Round, warm, fat tone with lower power but great for a soft blues tone or great fat classic rock sound too. These tubes perform very well in the Fender Deluxe Reverb Reissue. Country of origin: ChinaCountry of origin: China