Hi Tony,
I was originaly going to ask the same question about the crystal frequency but later realised that I think by the label "X1 crystal" he means the ultrasonic transducer. (Rather than a normal quartz crystal to set the oscillator frequency). I have been waiting to find out what he means by "not working". Does it not oscillate at all, is the output too low or is the frequency wrong ? I think the nearest thing to a tuned circuit is C2 (1000 pF) and L1 (33uH) this would have a resonant frequency of 876 Khz. The reactance of the capacitor and inductance at that frequency would be about 182 ohms so that with it being loaded by R1 (10 ohms.) and the base emiter junction (Via C3) the Q of the circuit would ve very low.
Les.