Thread: Hallicrafters S120 hum at no vol and hum with volume
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  #17  
Old 08-12-2017, 09:44 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
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Dude, just to reiterate, check the heater wiring to verify that the 1st audio tube's heater is at the bottom (ground) end of the string. If it's not, it could be introducing hum downstream of the vol. control