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Because of the amount of current that original tube type radios
require to function, it is best to have the original radio converted to 12
volts. Here is why…
The original tube type radio requires about 12 amps of current when
the radio is first turned on. Once warmed up the radio continues to draw
between 8 and 10 amps. In order for a voltage reducer to deliver
enough power to the radio the voltage reducer would have to deliver 24
amps when the radio is first turned on, and 20 amps during the remainder
of operation. (An additional consideration is the fact that the components
inside of the radio are very voltage sensitive and are easily
damaged by excessive voltage and variations in voltage. Radios work
best and have the longest life when the voltage supply is constant.)
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By contrast, if the radio were to be converted to 12 volts, it would
require just five amps to function. By converting your radio to 12 volts,
solid state tubes, and vibrators can also be installed which will eliminate
the warm up time. The radio would come on and play immediately
just like a modern radio does today. In addition, features like FM can be
added.
The ceramic type voltage reducers (about the only option) typically
have a (40%) error rate. That spells death to the tubes inside of the
radio which is designed for no more than a ten-percent voltage variation.
Imagine what would happen inside of your house if the voltage
varied forty percent?
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