I would think that class A amps with less negative feedback would have a bigger soundstage, that could be one of the reasons many tube amps have a great soundstage.
Why do some amplifiers throw a bigger soundstage than others?
Was watching a YouTube video comparing two Excellent class A amplifiers . the reviewer preferred, the one which threw a wider soundstage with the same set of speakers. Specified channel separation in db iis about the same in all quality amplifiers., so why does this happen?