This category includes the machines that use the innovative tecnology in which there is a work frequency fixed before, but the same is function of the inductance value of the external inductor for the heating.
The energy source is based on the use of one ore more triodes.
The generators which belong to this category may be divided in two families, one predisposed to work with frequencies included in the interval 80-400 kHz and another predisposed to work with frequencies included in the interval 18-40 kHz.
There are forseen generators with useful powers from 4,5 to 85 kW.
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