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Old 9th Nov 2019, 7:09 pm   #60
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 10,338
Default Re: Vintage Radio and Phonograph cutter schematic

Just looking back at Post#41, only slight hum was reported, I would check everything done since then and also determine whether the hum is 50Hz (mains, heaters etc) or 100Hz (HT ripple)

Lawrence.
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