The high voltage supply for a picture tube comprises a high voltage
transformer, which generates the anode voltage of the picture tube, and a
high voltage module with a switched mode power supply for providing a grid
voltage, which is higher than the anode voltage. The output of the high
voltage transformer is coupled to the transformer of the switched mode
power supply, for adding the output voltage of the switched mode power
supply to the high voltage of the high voltage transformer. Preferably,
the transformer of the switched mode power supply provides the high
voltage isolation, and at least the high voltage part of the module
including the transformer is potted with a resin. The high voltage module
provides advantageously also an output for a connection to the anode of
the picture tube, so that the module can be used with present high voltage
transformers, without requiring any modification. The primary side of the
switched mode power supply comprises a control stage with adjustable means
for setting a specific output voltage of the power supply. In a preferred
embodiment, this output voltage is adjustable between 300 and 500 Volts,
with respect to the high voltage of the high voltage transformer.
