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Original Message

RE: grid resistors first stage of amp

Posted by Naz on June 25, 2012 at 21:36:24:
>>CMiller combines with the grid to ground resistance to form a low pass pole. When the resistance is large and CMiller is comparatively large, F3 of the pole will be low enough to have an effect at the top of the AF band.<<

I thought there may have been confusion between grid to ground (grid leak) and series grid stopper but this confirms we are indeed discussing the grid leak R the as the statement is incorrect.

It is the series resistance including OP impedance, grid stopper and any attenuators in the chain form a low pass filter with C Miller.

The grid to ground (grid leak R) forms a high pass with any coupling cap preceding it, affecting only LF.

Tre has summed it up nicely elsewhere in this thread.

Naz