itself is the only tuned circuit. The nature of this circuit is not clear
unless the capacitances of the valve's anode and grid (shown dashed)
are taken into account; it then turns out to be a Colpitts oscillator
(Fig. 14.8). A disadvantage of this circuit is that most crystals are
capable of oscillating at what are called spurious frequencies. To
prevent this the anode coupling resistor is often replaced by an LC
tuning circuit, which has insufficient impedance to sustain
oscillations at any frequency other than the one to which it is tuned.
Man ...
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