This listing is for a pair of NOS Sylvania ECG 16AK9 vacuum tubes, made in the United States. These tubes are ITT dual triode 10-watt beam-power tubes, perfect for vintage audio and video applications. The brand of these tubes is Sylvania, a trusted name in the electronics industry. The model of these tubes is 16AK9, a rare and highly sought-after model among collectors and enthusiasts. These tubes are perfect for those looking to add to their collection or for those looking for a reliable and high-quality vacuum tube.