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At that power level a 5Y3 and longwire feeding a 16 ohm speaker should be plenty, a crystal won't be enough. I will say that is one beautiful radio, imagine listening to DX with the volume up and a good lightning crash makes its way thru... might have to check their shorts!
Half a megawatt is going to get into everything within a 100+ mile radius. I had problems with the 50 KW WCCO AM830 getting into the school bus garage base stations a few miles away, the peaks would make the 20 ma needed to key the base on a 600 ohm phone dry pair and audio would swamp the dispatcher mic circuit.
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