Hi Nicolas
You have to lower the value of the capacitor C5 (330 pF or 270 pF) or the capacitor C7 (470 pF) then adjust the variable capacitor C6 for 2-5V at output, the important thing is that output is not saturated. Remember that few picofarad are sufficient to bring the output from zero to max voltage.
For mustefa ubram
The circuit works very well with this frequency (only with this frequency). The battery are 2 X 9V battery for 18V power.
Best Regards
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