There are a lot of tricks just to screw up your mind in terms of presence or abcense of global Negative Feedback in the amp.
For example:
Today's amplifiers give it or take must have low output impedance to drive today's speakers. They also must have a desired power again give it or take. Sometimes designers would add an extra stage(emitter follower in bipolar designs) that only amplifies current(but no power) from previous stage that amplifies both. Introducing extra output stage to decrease an output impedance is another way of avoiding such term as Global Negative Feedback but with shure presence of such on the previous stages to the level of desired specifications.
So without knowing the inner details and schematics of the amplifier you CANNOT judge whether its performance REALY depends on NF. It's realy a good practice just to get rid of the ill-marketable dogma about an amount of Global Negative Feedback or any kind of such completely before choosing your component.
One thing is known to all electronic engineers is that NO amplification stage is STABLE with NO negative feedback -- otherwise the amp will become an oscillator.
For example:
Today's amplifiers give it or take must have low output impedance to drive today's speakers. They also must have a desired power again give it or take. Sometimes designers would add an extra stage(emitter follower in bipolar designs) that only amplifies current(but no power) from previous stage that amplifies both. Introducing extra output stage to decrease an output impedance is another way of avoiding such term as Global Negative Feedback but with shure presence of such on the previous stages to the level of desired specifications.
So without knowing the inner details and schematics of the amplifier you CANNOT judge whether its performance REALY depends on NF. It's realy a good practice just to get rid of the ill-marketable dogma about an amount of Global Negative Feedback or any kind of such completely before choosing your component.
One thing is known to all electronic engineers is that NO amplification stage is STABLE with NO negative feedback -- otherwise the amp will become an oscillator.