Quote:
Originally Posted by Jeffhs
I just looked at the tube layout and instruction label on the bottom of the radio, and am wondering why it lists the specifications (in part) as "105-125 volts, any cycles . . ." What power line frequency was this radio actually designed to operate on, or could it actually work on any available power source regardless of frequency?
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Some areas of the US were 50 Hz until the late 40's, and some rural areas (and places with Edison power) were DC early on. I have a Magnavox "Concerto" phono from 1936 that is listed as 117 Volts, AC or DC. It has five tubes (two 25L6, two 25Z5 and one 6C5 with the heaters in a series string...no transformer so it doesn't care about the incoming power frequency! I also have a Mills jukebox from the same year, and it also has the ability to run on DC. It uses 2A3's for outputs, though, and I haven't looked the schematic over yet to see how it does the job on DC. I think there are some connection re-configurations you have to make.
--Bob