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The Ubiquitous Radio Hum
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02-20-2017, 10:16 AM
old_coot88
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Join Date: Sep 2009
Posts: 2,562
I never seen a radio of that vintage that didn't have some degree of hum, particularly ones using direct-filament tubes (e.g., 26, 71A etc) with the filaments run on AC. Some had a 'hum balance' control but the hum was always there anyway.
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