You are bidding on a pair of vintage Western Electric type JW 2C51 radio/audio tubes made for the US Military. These are also known as 396A tubes. They test strong on my calibrated TV-7D/U tester, where the minimum for a good tube is 26 on each plate. One tests at 47 on one plate, and 44 on the other plate, while the other tube tests at 42 and 44, so these nice strong tubes. They have different date codes, 052 and 326, as they were selected by their strength to make a great sounding pair for your amplifier. Shipping weight is 6 ounces. Please see my other auctions for more interesting radio and audio items, and tubes.