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The intriging question ot the line cord connection to radio is because this kind of receiver were called "transformerless", meaning that the tubes filaments are designed to get certain amount of voltage, (35, 50 and 12 volts) and since they are all series connected, the total amount is around 127 volts. The first tube connected is the rectifier, and it draws the neccesary voltage to make the circuit works. Of course, when one filament is gone, the whole receiver becomes "dead."
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