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Figure 32: Determination of loading Capacitor C2.<br />
and the lumped capacitance added to the circuit. The output<br />
capacitance of the tube is given on the Eimac technical data<br />
sheet. <strong>Tube</strong> capacitance is measured in a shielded fixture (using<br />
a 4-wire bridge at 100 kHz), therefore the value that is obtained is<br />
one that is confined to the tube alone. Stray capacitance becomes<br />
increasingly important at higher frequencies; at 2 MHz it may be<br />
neglected.<br />
The inductance of the anode choke (Lc in figure 29) may be<br />
determined by noting that it is in shunt with the tuned circuit. If the<br />
rf current through the choke is to be limited to one percent of the<br />
tuned circuit circulating current, the inductance of Lc must then<br />
50
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