Tested for shorts, emission and noise. IEC imported tubes into the United States. These are made in Great Britain by Mullard and their date codes match. They have black plates and halo getters.
The tubes are as mint as they come and the boxes are in excellent condition. I seldom use the term New Old Stock, and these certainly are. See the pictures for condition and ask questions. I'm in the process of listing thousands of tubes.If you want something in particular message me to see if I have it.