U
ultra-linear amplification An audio-frequency push-pull output stage using tetrodes or pentodes in which the screen grids are fed from tappings on the primary winding of the output transformer. This arrangement feeds a fraction of the output voltage to the screen grids thus giving negative feedback and by suitable choice of the position of the tapping points odd harmonic distortion can be reduced to a minimum. Even harmonics are, of course, eliminated by the use of push-pull and thus an output stage of this type is capable of excellent linearity.
ultrasonics The study of acoustic waves in material media, the frequency being above that of the audible range. Such waves can be generated by magnetostriction and piezo-electric devices and have ...
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