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Original Message
RE: grid resistors first stage of amp
Posted by Jim McShane on June 25, 2012 at 15:41:48:
I think there is some confusion in this thread between:
a) the "grid-leak" resistor that has the task of providing a path for electrons to escape the tube's grid where they can collect; and is usually connected to the signal input and to ground and is the dominant factor in the input impedance of the stage, and
b) the grid "stopper" resistor which is usually a relatively low value resistor in series between the output of the previous stage and the tube's grid - this resistor would be in series with the input capacitance (Miller and other) of the tube.
I suspect the somewhat confusing terminology didn't serve this thread well.