I am selling parts to build 4 crystal radios. Each set includes a vintage large metal dual gang air variable tuning capacitor, A large ferrite rod antenna and a vintage Russian D18 germanium “Holy Grail” diode. I will include 4 knobs for the tuning capacitors too. 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 a crystal earphone or high impedance headphones.