Tube DIY Asylum

RE: Unbypassed cathode resistor and feedback

114.78.68.180

In Reply to: RE: Unbypassed cathode resistor and feedback posted by danlaudionut on October 26, 2009 at 17:32:46

"The input IS the grid to ground signal
and that is not being changed by the
cathodes signal at all."
Dan,
To understand what's going on, you need to consider grid-cathode as the input, not grid-ground, . Ground is not relevant to understanding the operation of a tube (in fact, if anything, it can be an obstacle). Ground is simply a reference point.
Think of a grounded grid amplifier, such as the second stage of an LTP phase splitter or the upper stage of a cascode. The grid is grounded in both cases (as far as AC is concerned), yet both these have inputs, namely, cathode inputs.

Edits: 10/26/09

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RE: Unbypassed cathode resistor and feedback - danlaudionut 22:03:41 10/26/09 (0)

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