Hi Nicolas
Great work, at the moment I'm in Switzerland and I cannot test your pcb, but remember that the "secret" of my pcb is the double face, at the bottom there are 6 strip, one strip is in corrispondance with the TR3 collector and another strip is in corrispondance with the TR1 base, this causes a capacitive coupling of very few pF and then the stage becomes to oscillate. If with your pcb you have at the output a DC voltage of about 2-4v and the voltage drops when you touch the input then the lrl is working. The "phenomenon" increases the output voltage. My pcb is very critic and the inferior strips must be aligned with the superior strips but obviously the superior strips are cut properly to achieve the links between the components.
Best Regards
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