The 2N3392 transistor is a (cheap) low-power, low-noise and high-gain. If you wish to use a TUN, cross reference the parameters with one of the units from this list:
Potentiometer R5 of 100K is a linear type. The value of C1 may need to be between 0.05uF and 0.1uF (47nF/100nF). Experiment with the value for best performance.
Capacitor C3's working voltage should be at least 16V.
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