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If the resistance element in the vol control were open at the ground end, it would cause what you describe (or if the lug-to-ground connection were open).
'Ground' in this instance refers to the isolated or 'floating' common ground buss, standard in most all post-1940 series-string radios. Sets with power xfmrs continued to use chassis ground.
Last edited by old_coot88; 12-06-2016 at 10:20 PM.
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