Tube DIY Asylum

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RE: Has anyone else tried this experiment?

Posted by vinnie2 on July 10, 2017 at 04:25:07:
Yes, but you could see a difference with any the different size test patches couldn't you? What is bothering me is that I hear NO difference between the amps.
The problem I am trying to solve is quite simple really. I have read in multiple articles that if amps are of good construction and are played within their limits for no distortion it will be very difficult to hear any differences between them. My own listening so far is agreeing with that. So far several people have told me why they think it is not true and why my method won't work, but no one has actually told me they have tried it for themselves and heard a difference between the amps.
Your first and second paragraphs are written as if you consider them to be gospel. Do you have a source, or is this your opinion?