We found this circuit in an old Argentine publication. The transistor can be replaced by a more modern equivalent such as the BF494 and the consequent inversion of the polarity of the supply. L1 consists of 4 turns of wire 28 in the form of 1 cm and L2 of 3 + 3 turns on L1. The transformer is an output type for transistors and the capacitors must be ceramic. The 25pF capacitor must be replaced by the equivalent of current values of 22pF or even 27pF. The output must be applied to a small audio amplifier. L1 is 100 mH.
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