This oscillator uses two transistors and operates the crystal in the fundamental mode. CT and C2 should
be about 2 700 pF for 1 MHz, 680 pF for 5 MHz, and 330 pF for 10 MHz. 150 pF can be used for up to 20 MHz. The output is a near perfect sine wave. Try varying Ci and C2 for best waveform. About 2 to 6 Vpp is available.