# Voltage signal from a Geiger-Muller counter

In a Geiger-Muller counter which is the signal produced? If we imagine the tube as a capacitor, we intially have a certain voltage between the plates (the cilinder and the filament). But when the electrons arrive at the anode and they are collected by it, the voltage falls? And slowly the positive ions will reach the cathode, so they invert the voltage? Which is the correct behaviour of the signal produced?