A class and push-pull


Posted on Dec 2, 2012

Pure A class is the most simple topology for designing an amplifier! The tube or the power transistor is loaded directly by the speaker (often thru a transformer, fro impedance matching!), and is biaised at the current necessary for full modulation (that means a maximum power dissipation for no input signal).


A class and push-pull
Click here to download the full size of the above Circuit.

The consumed to output power ratio is very low: 12.5% for a current source load (see PASS amplifiers), 25% for a transformer loaded triode with no grid current, 50% for the same triode in class A2 (with grid current) and 50% for a pentode (or tetrode). Un




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