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television however deflection is practically always magnetic.
The usefulness of an oscilloscope would be very severely limited
without amplifiers to enable adequate deflection to be obtained
from weak signals. Ideally, such amplifiers would give a known
constant linear gain at all frequencies from zero to the highest in any
signals likely to be applied, and would introduce no phase shift. Such
amplifiers have much in common with video amplifiers and their
design, particularly where high gain is required, is not easy. In fact
the principles of these amplifiers justify more space than can be
given here and are therefore described in the nex ...