A method of producing an electrode brain probe assembly, using a flexible substrate comprising a polymeric layer bearing a conductive material coating. The premix gas feed and the pilot gas feed are carried out in combination, in such a way that a continuous mixture ratio between premix gas and pilot gas can be set within the premixing burner. According to a second preferred embodiment, a resistor arrangement with resistor elements is specified that are connected to each other by a flexible connection element.