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Old 14th Jan 2019, 12:53 pm   #74
trobbins
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Join Date: Oct 2009
Location: Melbourne Australia
Posts: 898
Default Re: Puzzling audio circuitry

The lower triode cathode node also has complexity from the feedback voltage and current. It may be remiss to just assess that as a voltage or current feedback node.

Morgan Jones (3rd Ed) had a go at assessing that node in the similar, but probably simpler Williamson input stage - its not a simple set of calculations.
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