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Old 9th Nov 2019, 7:21 pm   #61
Join Date: Nov 2016
Location: Budapest, Hungary
Posts: 348
Default Re: Vintage Radio and Phonograph cutter schematic

Originally Posted by ms660 View Post
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)

I believe that the hum is 50 cycle. Will re check again, might change the first 8A electrolytic cap too and will test this in another room further away from any other appliances.
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