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Iain Churches wrote:
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Keith G wrote:

After an hour I can say it's fine/OK and
if it was all I had I wouldn't be too unhappy, but usually
when I swap
back
to the valves (haven't got time atm) I find the
*improvement* is
instantaneous and reaffirming.

It's called listening fatigue. The break that you give
yourself so doing
allows the ear to recover. Now try it the other way round !

Hmmm I read somewhere that the opposite is usually in play.
There seems
to be a common bias to prefer the second smaple in an A/B
comparison.

Actually it seems that was what I was saying ! I wasn't thinking of
an A/B
comparison per se actually but I can well believe it.

Interesting becuase i always thought listener fatigue happened after
extensive listening, that would be the B in an A/B comparison

How about after an hour ?
depends on the system. But I think you missed the point the B will
always follow the A so it will always involve greater listener fatigue

But if there's a short break between A and B ?

Graham

To solve this problem why don't we do the B sample first???