For sale is one perfectly matched quad of genuine KT90 made by EI Nis tube factory in Yugoslavia in 90s, two are branded EI and two are branded Billington, they are all the same batch and the same etched codes, they come in original EI KT90 boxes.


Genuine EI KT90, with dual OO getter and zirconium getter, welded plates.

They are slightly used, tested 80-85% of NOS values, matched within 5%, very nice tubes with lot of life left, tested with 250V on plates and screen grids and -12V on grids.



See also my other auctions and visit my eBay store for more vintage tubes and tube parts. More than 250000 tubes in stock and more than 35 years of experience. 


If you buy any item on ebay from me and for if you are not fully satisfied for any reason or have any complains, please send me message before leaving negative or neutral feedback or opening a case. I really do care about your satisfaction and I’ll do my best to solve any kind of problem.