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•Vintage transistor radio sound using your ipod
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•No destructive modifications to the radio necessary, radio still works
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•Ear phone output jack re-wired to audio input potentiometer, where the radio detector to potentiometer connection is broken and bypassed to an audio input plug when a plug is inserted into the jack. Schematic shown here.
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•Radio had to be restored by replacing electrolytic and paper caps then modified.
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•Info shared here on how to do this.
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•Radio details:
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•built in 1957
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•8 transistors
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•4 for RF signal chain
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•4 for audio signal chain
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•audio signal chain uses transformer phase splitter and transformer output
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•no negative feedback used in audio signal chain