The Devil said:

snip

Anyway, I hope others find this useful. For me, KT88s in triode are
the supreme reproducers of music. And man, just *how* great they sound
in my amps is something to behold.

I always knew this :-)
Even the lowbrow JJ Teslas I use, show this effect.

Some time ago, an old friend brought 2 Jadis JA-80 monoblocks for a
checkup and if necessary, replace the valves.
There were EI KT90s in there, testing 100% on my AVO and matched.
The Jadis' use UL operation.
We put in the cheap JJ KT88s.........it got worse.
Then we did the same comparison in triode mode, but with higher values
for Rg2 because of the increased Pg2.
Bingo!

Very glad - and relieved - to be back in musical heaven! :-)

I'll tell you a little secret: There *are* no typical Siemens valves.
Siemens bought them from Telefunken. Really.

How's your German?
http://www.jogis-roehrenbude.de/
Click on "Rohren Geschichtliches".

--
Sander deWaal
"SOA of a KT88? Sufficient."