Abstract: An evaporator cell for vacuum deposition on substrates comprises a cell housing which has one end with a vapor escape opening and an opposite end into which is positionable a plug member which is moved in the housing so that its closed end be positioned in a position closing the vapor escape opening or away therefrom into various opening positions for regulating the amount of vapor which escapes during the vapor deposition. The plug is advantageously a closed tubular member which contains a heating element therein and is advantageously moved by means of a plunger which is mounted in a wall of the evaporator so as to be sealed.