Two, new in box, Zenith brand 1L6 tubes. These are critical to the proper operation of the Zenith Transoceanic 600 series radios. Tested on a Hickok TV-3 military tester that has been calibrated, just to make sure.Straight pins, excellent original logos, excellent silvering. Tubes test at 850, 850 where pass/fail is 410 micromho in the pentode section and 450, 450 where pass/fail is 190 micromho in the oscillator section. They have the same structure inside and out, having date codes of "312 EBY" and "312 EBX", manufactured by Sylvania for Zenith in the late 1960's. Many other lots of tubes for sale this week. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets". The seller is "igolioto" and is located in this country: US. This item can be shipped worldwide.