"David Satz" wrote in message
om...
More up-to-date analyses of Otala's work have shown that what his tests
show is not limited only to dynamic distortion. And with the equipment I
have available, the best signal source I could create doesn't have nearly
as high a slewing rate as either of Otala's two main recommended test
signals. So my results are probably more like those of ordinary IM tests,
only weighted somewhat more toward revealing dynamic distortions.

I'm virtually certain that better-controlled test signals could provoke
worse behavior from some circuits, and I'd really like to see that, since
it could well reveal even further differences among different circuits.
Still, even with what I have, I was able to find some clear distinctions
among the distortion performance of different pieces of equipment.

That's about all I can say because of the limits of my test signals. OK,
I can say a few things in the more clear-cut cases:

- The ART "Tube MP" is grotesquely bad. By a considerable margin it had
the highest distortion, in its normal operating range, of any equipment
I tested. And the Aphex "Tubessence" preamp (model 107, not the 1100)
had second highest.

[snipped the rest]

David, it's not clear from your post -- were you using Otala's sine/square
test signal? Or were you doing a different sort of IM test?

Peace,
Paul