Hi Gismo5367,
Over the years I have constructed many of these receptors using different types of crystals (Germanium is the one that should be used, as for coils they also vary 200/4000 ohms, some i have purchased from eBay some I have made myself.
Wiring, I have I have stuck to the original schematic as was used by the Scole group.
The amplification is provided by the Echo megaloop amp they are used as hearing aids and can be purchased 2nd hand on ebay.
See attached images...
Sadly this week saw the crossing of Mr Robin Foy.
His legacy shall always be what he and the Scole group achieved during their time together
R.I.P Robin