Abstract: In an amplifier which generates an output voltage which is proportional to an input voltage and can be picked off between the outputs of two push-pull output stages and has peak-to-peak values of up to twice the supply voltage of the push-pull output stages, each push-pull output stage is driven by a differential amplifier having a positive and a negative differential input in each instance and whose polarity is so defined that the outputs of the two push-pull output stages have voltages of like polarity when identical voltages are present between the positive and negative differential inputs of the two differential amplifiers, a differential input of one differential amplifier being connected with a differential input of like polarity of the other differential amplifier. The remaining two differential inputs of the differential amplifiers are provided for applying a voltage proportional to the input voltage.

Abstract: A television projection system for generating picture points of a television picture has at least three light sources which may be controlled in intensity for light signals (R.sub.L ', G.sub.L ', B.sub.L ') of different wavelengths, wherein the hue of each picture point is fixed by means of color value signals (R, G, B) in a first base system which may be represented in a CIE diagram by corner points of a hue region which are defined via wavelengths of screen phosphors. The wavelengths of the light signals determine a second base system which shares a common range of hues with the first base system. Further, an input circuit is provided for generating at least three electrical signals which are proportional to the color value signals (R, G, B) or contain a mixture thereof, and a control device is provided for controlling the light sources.