Abstract: Method for evaporating a getter material in a vacuum tube, comprising a step of providing a high frequency induction coil on the outside of the vacuum tube, near the location of the holder of the getter material, and passing an alternating current through the high-frequency induction coil for evaporating the getter material. The alternating current is generated by a high-frequency generator with a variable frequency. The induction coil and a capacitor are jointly incorporated in a resonant circuit. During execution of the evaporating step, the frequency of the high-frequency generator is attuned to the resonant frequency of the LC resonator. The dissipated power in the getter material in the holder is then determined from the power delivered by the high-frequency generator and the dissipated power in the LC resonator. The dissipated power can be controlled by adjusting the total power of the high-frequency generator.