 The Antique Wireless Association of Southern Africa is devoted to the "maintenance and preservation of our amateur heritage" for enthusiasts of older types of short wave radios and amateur equipment, and maintains a museum exhibit in Johannesburg.Repair and restoration of vintage amateur radio equipment may involve replacing vacuum tubes, reforming electrolytic capacitors if needed, replacing any faulty resistors, replacing two-wire power cords with three-wire cords except on transformerless AC/DC radios, and receiver alignment as necessary.Since vacuum tube gear contains potentially lethal voltages, a number of safety measures, such as discharging power-supply capacitors and keeping one hand away from the chassis when working on powered-up gear, are commonly employed.