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hpupo 14th June 2011 02:01 AM

push pull adjustable fixed bias
 
When designing adjustable bias for push pull circuits, do i need only one pot that increases bias voltage in one tube and at the same decreases on the other, or, is it better to have two pot, one for each tube? Does this even matter?

Thanks

HollowState 14th June 2011 02:08 AM

In my opinion it's always best to have two adjustment pots. Either independent, one for each tube, or one for balance and one for level. Either way works equally well.

hpupo 14th June 2011 03:06 AM

thanks, but how would i do that? Do you have a circuit i could take a look? Also, how do i calculate the resistance? I mean i dont even know how to follow the current path on that part of the circuit (under normal conditions, of course, without considering grid current)...

hpupo 14th June 2011 03:25 AM

nevermind, i just found my answer....


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