EL84 Tungsram NOS note: may also be marked EI historic... more
Product information "EL84 Tungsram NOS"
EL84 Tungsram NOS
note: may also be marked EI
the serbien military demanded a higher quality EL84 than Ei could supply at that time. So Ei had to buy EL84 from Tungsram (Hungary) and marked them "Ei" cause the military completely refused importet tubes. since Ei hated to buy and remark foreign tubes they printed them not very nice as a sign of their reluctance to do so.
Now some of these high quality EL84 with the Tungsram typical lots of barium getter are here for sale.