oldguy
Lefty O'lman
These look interesting. A DSP to measure tube saturation. Not much info out there yet, though. Could be a tech nightmare, time will tell.
http://boltamps.com/index2.html
http://www.premierguitar.com/Video/20090408/610/Bolt_Amps_100_Watt_Amp_Head_Demo.aspx
http://boltamps.com/index2.html
http://www.premierguitar.com/Video/20090408/610/Bolt_Amps_100_Watt_Amp_Head_Demo.aspx