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Class-C stage grid resistor
On Feb 2, 7:05*pm, Graham wrote:
On Feb 2, 6:29*pm, "Antonio Vernucci" wrote: I cannot give you actual values for your set up, but basically, if you have already provided optimum bias with your fixed bias voltage, then you will not need to develop any more bias across a grid resistor. peter My fixed bias is set for an idling plate current of 10 mA. The only criterion behind that bias setting was to keep the final tube safe. So, it may not be optimum with regard to the final stage efficiency. On the contrary, it is surely not optimum because, without extra bias, the tube operates class B. More bias is needed (produced by the grid resistor) to have the tube operating class C. 73 Tony I0JX With a fixed bias supply *, do *you *really *need a *grid *resistor as such ? 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 - The original data has guide lines on the vlaves use in class C telephony ..... http://www.r-type.org/pdfs/829b.pdf G .. |
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