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Nice well presented instructable but please don't destroy working tubes (but if you are make it the cheap old Russian tubes because there are literally warehouses full of them).
Another way would be to put a 100pf capacitor across the LC circuit. It will resonate at a lower frequency.
Yes it will but you will have to add more turns to the tuning coil.
It will, but you will have to add more turns to the detector coil.here is a good website on the construction.http://www.hws.org.au/Crystalset%202000/mystery.html