Ei Niš Koncertino radio, test September 2023 

A Ei Niš Koncertino radio from 1964, test of FM reception in September 2023. Completely restored in September of 2023, made in Yugoslavia by Ei Niš.
Some issues that it had:
open output transformer hum-bucking winding, was able to rewind it manually, about 90 turns
bad output tube coupling capacitor, replaced before first power-on
open main smoothing electrolytic capacitor
stuck controls for tone and volume
was extremely dusty inside, like it was used in sawmill, I blew it with compressed air and washed chassis with water and tiny bit of degreaser
wood was deep cleaned and used some wax to restore the finish and luster