This is a circuit diagram for Champion 781A / 78IB Portable Receiver. Seven valve (including rectifier),four wave band portable receiver with electrical bandspreading, R.F amplifying stage separate out put valves...
This is a circuit diagram for Champion 781A / 78IB Portable Receiver. Seven valve (including rectifier),four wave band portable receiver with electrical bandspreading, R.F amplifying stage separate out put valves for battery and mains operation fr......
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