This video provides information on assembling a reproduction Z-675 battery for the Zenith 5G500 portable tube radio. The Z-675 battery is an AB battery, providing an A voltage of 6 volts for the tube filaments and a B voltage of 75 volts for the tube plates.
The Zenith 5G500 is of historical interest as it introduced the patented Zenith Wavemaget antenna. This Wavemagnet was an important part of the first Zenith Trans-Oceanic radio introduced in 1941. Featuring a horseshoe design with hinged suction cups on the base, the antenna was designed to be attached to the window of a bus or railroad passenger car, or a window in a steel building, enabling reception of radio waves that would otherwise be blocked by the steel.
See the end credits for information on order a reproduction Zenith Z-675 battery for your 5G500 radio.