Marched pair of 6S2S (6C2C) tubes. Tubes were measured with the precise L3-3 (Л3-3) tube tester. It is direct replacement for the american 6J5GT and VT-94D tubes. Made in USSR, Nevz (Novosibirsk) factory in year 1965. Service life: not less than 2000 operating hours. New in box tubes. Will be delivered in original boxes with measured parameters attached.