I am selling parts to build 4 crystal radios. Each set includes a vintage large metal dual gang air variable tuning capacitor with knob, A large ferrite rod antenna and a vintage Russian D18 germanium “Holy Grail” diode. All of the parts are in excellent cosmetic condition and in good working order. The unique thing about a crystal radio is that they don’t need any power, They just require an antenna and ground. You will need to supply your own piece of wood to mount the parts to and a crystal earphone or high impedance headphones.
Mike VE5MGH