Is This Statement Correct?????
I copied and pasted this from another site and I'm no expert..
QUOTE:
All cheap amplifiers use feedback, and there are no amplifiers above 30 -40 Watts without feedback. This is a very important point. There is no solid state amplifier that can be designed totally without feedback.
Are they correct??????????
Different ways of implementing feedback
Quote:
Originally Posted by VE4CAN
I copied and pasted this from another site and I'm no expert..
QUOTE:
All cheap amplifiers use feedback, and there are no amplifiers above 30 -40 Watts without feedback. This is a very important point. There is no solid state amplifier that can be designed totally without feedback.
Are they correct??????????
I'm no expert either, and if anyone wants to correct me, I wish they would.
Feedback can be implemented in different ways, some supposedly worse than others. For example there are many S/S amplifiers with "zero global feedback", for example, my current Monarchy amps or my previous Bel Canto amp. As you may know, most amps, (including power amps), are implemented with 2, 3, or sometimes more stages of amplification; as I understand it, early stages supply mostly voltage gain while latter stages supply the current. "Global" feedback spans multiple stages of gain and is considered the kind most to be avoided. "Local" feedback is considered more inoccuous; it affects only a single stage. Then too there can be more or less feedback applied, whether to a single stage of multiple stages.
I don't know if there a any S/S amps with no feedback at all, but if so they are very rare. On the other hand there are quite a few that use only small amounts of local feedback. To my knowledge feedback can and often is used in tube designs.