Originally posted by Lattice333
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It might be interesting to see what happens if you raise the frequency of the oscillator to make more energy available, which should happen if Naudin's paper is correct. If I understand the circuit correctly, you can try to lower the base capacitor from 400 pF to about 100 pF (take a trimmer, so you can adjust). That should double the frequency. And then see if you can find a resonant point.
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