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Old 12th Oct 2019, 3:25 pm   #20
ms660's Avatar
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 10,562
Default Re: Vintage Radio and Phonograph cutter schematic

There's another one here (220VDC on the plate):

The cutter needs an AC signal not a DC voltage, the amplifier valves amplify the AC signal but they need DC on their plates/screens in order to do so.

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