A BJT class AB audio amplifier has .27 ohm resistors between the push-pull outputs and speaker. There is 55mv and 59mv, respectively, across each resistor meaning a quiescent current of over 200ma. This is the lowest it can set to with the bias pot. Is this much current normal or even acceptable for class AB using BJTs? Is there any way to reduce this or at least have both outputs be the same?
Thanks for the feedback. Not sure what is meant by which class AB design. I can tell you it has a differential input and a voltage amplifier, couple for driver transistors and two output transistors which are 2N4915. Rated output is 42W min into 8 ohms. No bias diodes, uses Vbe multiplier.
Measurements were done after the amplifier warmed up for several hours connected to a speaker set at low volume. I will retake the measurements again after warming up with higher volume to see if there's any change.
What I really want to know if I should be concerned with the 200ma quiescent current with no signal and no load?