NOS NIB GE 12AT7WA 6201 ECC801S MATCHED PAIR SOLID-FOIL-GETTER TUBES USAF 1970's
6201 = 12AT7WA = ECC801S = E81CC = CV3508 = CV5212. 12AT7WA = 6201. It is often used for Hi-Fi applications. It provides very smooth mids and high end with a lot of detail. YOU CAN NOT GO WRONG IN YOUR 12AT7 / ECC801S / 6201.