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My practical experience is that lowering the grid resistor I always
get more output power FOR THE SAME GRID CURRENT. Same experience here. So ... how do you know its the same ...if you use a meter .. then the shape factor of the grid pulse will change the meter reading .. wider pulse lower peak will still give the same reading ? need to check the waveform .. not easey .. simple way is to forget the resistor and provide a variable bias psu . and inject via a low ohm rf-choke ... and add some link to the bias voltage and the pa plate supply ..no bias no supply .. simple relay ? What is commonly called "grid current" is not the instantaneous grid current, but its average value (i,e, its DC component). So, when one measures the grid current using a DC meter, he has not to worry about the actual current waveform. 73 Tony I0JX |
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