2-34BEAM-POWER TUBESare also used as power amplifiers. In addition to the in-line gridarrangement, beam-power tubes use a set of negatively charged beam-forming plates. The beam-formingplates force electrons that would normally be deflected from the plate back into the electron steam and,thus, add to the number of electrons the tube can use for power amplification.VARIABLE-MU (µ) TUBES or REMOTE-CUTOFF TUBESwere developed to extend theamplification range of electron tubes by avoiding the possibility of driving the tube into cutoff. This isdone by uneven spacing of the grid wires.
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