I noticed my T-amp was getting pretty warm after only a short period of fairly low volume use, so I borrowed my Father's Multimeter to ensure my 12V wall-wart was indeed a 12V. Turns out it's actually putting out closer to 19V....I'm surprised the amp isn't dead.
Check your wall-warts!
Axiom M60ti
Hsu VTF-2 Mk2
NAD C320BEE
NAD C542
Systemdek IIX
Cables by Unity Audio