Keith G wrote:


"Ian Bell" wrote in message
...
Keith G wrote:


"Ian Molton" wrote



Who says valves have to produce a non-linear output? you can build
perfectly linear valve amps if you try. A linear valve amp and a
linear SS amp rated to driev the same loads, will sound *identical* to
each other in any measurable way.


'Measure' being the operative word. In the real world the difference in
the sound *quality* is night and day AFAIAC.


Is that right? So how do you *measure* quality?



Simple, you need a timing device to time how long it takes you to get fed
up with the sound you're listening to.


That's not a measurement, it's merely a sample.

Ian