We describe a traditional configuration of a crystal oscillator with a pentode tube. The frequency is given by the crystal can reach 50 MHz typically.
The coil must be sized according to the generated frequency and the circuit feed is done with a voltage of 400 V at the junction of the coil with the 39 k resistor.
The capacitors must have working voltages compatible with those found in the circuit. The output is made by the capacitor of 47 pF or 50 pF of ceramic.
In figure 1 we have the complete diagram of the oscillator.
Figure 1 - Full diagram of the oscillator.
