Tung-Sol tubes are quite simply the absolute best. We design and manufacture our tubes, engineered for demanding high fidelity, reliability and overall warmth. Be sure to insist on genuine Tung-Sol vacuum tubes the next time you retube - you'll be getting the absolute best possible tubes for any demanding application. Tung-Sol Item No. 12AT7 TUNGSOLGet yours today; with the security of our many decades of experience and Sam Ash Direct efficient order processing, your satisfaction is guaranteed!