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This Post Has Been Edited by the Author
In Reply to: RE: PP Class A OPT Loading posted by Michael Koster on March 20, 2012 at 11:54:00
One important feature I forgot to post about the simplified model: since all three windings have equal turns, the (AC) voltage swings in each winding are equal. For example, this is important to see how the voltage swing in a cut-off tube is affected by the current in the other tube. Also, this voltage is impressed against the high-Z load on the third winding to make output power.
In this context, the crossover problem you mention comes from the fact that each tube can only conduct in one direction. In AB or B modes, each tube will cut off for a considerable fraction of the cycle and the other tube's current will need to rise at a different rate to meet the zero-net-current condition when the cut-off tube does not pass negative current. Of course, the voltage across a cut-off tube could go negative.
Edits: 03/21/12Follow Ups:
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