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

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

https://www.dropbox.com/sh/0yfx95n1i...616_073254.jpg

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.

Lawrence.
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