Sufficiently to be heard through a headphone or speaker. Taking a tiny voltage, such as an incoming radio wave, and increasing it Radio tubes offer two important features. Perhaps more radio tubes could do part of the job of expensive disposable batteries. Recognizing these problems, radio makers, many of which also made and sold tubes, sought to develop battery-less radio sets. Worst of all, if you accidentally reversed the A and B battery connectors, you could fry your radio's precious tubes. Lead acid cells could leak acid, which might drip out of the radio cabinet onto your lovely Persian rug. A dead battery could leave you radio-less in the middle of a crucial broadcast. The farmer could simply hook up the battery to a generator and recharge it.įor the portable radio user, the price of mobility was a large, heavy,Įarly battery sets had several drawbacks. Often, the only availableīattery was taken from the family truck or car. Rechargeable nickel-cadmium battery packs didn't exist in the "good old"ĭays, but some owners of "farm" radios used rechargeable leadĪcid batteries, of the type still used in cars. Radio engineers soon designed circuits to eliminate the C battery in a typical radio circuit. These batteries were known as A, B, and C. It also gives plans for two inexpensive battery eliminators that you can build, with additional suggestions and technical data.Īll early radios used batteries-as many as three batteries in the earliest sets. This article gives you some history on battery use in old radios and advice on how to power them with modern batteries. These include tube portables, such as the Zenith model K-401 shown below, and "farm" radios, which were used in rural areas where there was no other source of electrical power.
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