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Class-C stage grid resistor
With a fixed bias supply , do you really need a grid resistor as
such ? Yes, because the fixed bias I have chosen causes the tube to operate in class B, whilst I wish it to operate in class C. how is the -Ve bias reaching the grid ? ....with the cathode earthed .. the fixed bias is 'required' .. I would think for a given drive level ... increasing the -Ve grid bias would reduce the conduction angle and slide the stage from class b to c as the peak drive level would need to overcome the bias to allow the grid to conduct .. thus the conduction angle is reduced ? G ..- Hide quoted text - - Show quoted text - I agree with your statements but they do not help me much with regard to my original doubts The original data has guide lines on the vlaves use in class C telephony ..... http://www.r-type.org/pdfs/829b.pdf I have several data sheets for the 828B of various manufacturers but with the grid resistor value they specify I obtain less output power than with a lower resistance value 73 Tony I0JX G .. |
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