I am selling parts to build 4 crystal radio sets. 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 diode. All of the parts are in excellent condition. You will need to supply your own crystal earphone or a headset. Pickup in Humboldt or I can ship via Canada Post Extra Small Flat Rate Box which costs $19.94 including tax.