Pure class A is exactly the opposite of class B - in class A, output devicesĬonduct their full portion of current, signal or no signal. Knowledge, there are no true class B amps made anywhere in the world today forĪudio, they all work in class AB or class A. Poor, as they will be well in their non-linear region. In addition to this, their audio operation will be rather Passes from the plus to the minus half-time and back again, since ideally matched Transistors open up and that there will be significant crossover distortion as the signal Important and obvious ones being that there will be a delay in conducting until the This is unacceptable for many reasons, the two most

A true class B amplifier will conduct exactly Parameters, and the second is to effectively blur the sound you hear, since speakerĬones are busy heating up instead of reproducing sound. One is to produce more and more heat in the speakers, which is badįor the speakers as it heats them up and causes them to change their operating Will be effectively insignificant, of no practical consequence. Heat - how do you turn 0 Hz into sound? If this DC component of the signal is low, it Speaker, the speaker cannot do anything with that DC but turn it into pure and simple Let's investigate this just a little further. Of current used by output stage transistors so as to keep them 'open' or conducting The other is routinely used to adjust the bias or quiescent current - the amount Guy decided a proper DC servo was far too expensive, adding all of $3 to the factory One is used to adjustĭC offset in cases when the 'maximum savings!!!' light was flashing and some wise Large, they are used in power amplifiers, mostly for two reasons. To appreciate this, we have to look where such components are used. To damn poor performance from otherwise solid units. Possibly being a smoker certainly doesn't help. Slowly settles on them and degrades the initially not too good a contact, and your

Pots degrade to unbelievably low levels of operation after a year or two of service.īeing generally quite open, they are highly susceptible to common house dust, which When satisfied they got the worst possible, they happily solder them inside theirįar too many products I have seen over the last few years have had their trim They all seem hell-īent on finding the absolutely cheapest and worst trim potentiometers on the planet. I don't know why, but over the last few years there seems to be a race onĪmong the manufacturers of audio in the low and medium class. Adjusting the Bias Of Your Amp Put a tiger in your amp! You'll be surprised.

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