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In addition to the 60 cycle HV supply, (an electric chair...one should use great caution when working on it), and lost of loctal tubes, (which Philco invented), the design also features an eight position tuner with AFT (automatic fine tuning). A control voltage from the audio discriminator is fed back to the tuner oscillator to keep reception centered on the audio carrier. This feature was not much used by other manufactures until much later. One of my favorite 7" sets.
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John Folsom
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