Hi Geo,
Good work, but I don't know if my lrl works at this frequency, I have tried but with bad results. TR2-TR3-TR4 stages work well in the range 2-10Mhz, with 59Khz you must change C13 and C15, try 10 or 20nF, TR1 is also the "heart" where is the detection of the phenomenon, the base-emitter junction has a capacity of about 10pF, compatible with the resonant frequency of L1 / C1, very far from 59Khz. However, in the collector of TR4 you must have 1-4 volt AC, also check that the LRL functions in reverse mode as happened to another member of the forum. At pin out of LM358A there is some change touching the antenna? If not there is a wrong bias in LM358A, If this is the case try to connect a resistor (about 100K) between the pin - of the LM358A with + 12V and if there are no results with ground.
Best Regards
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