Thor is using dual triode tubes (looks like 12AX7 family tubes). They define "reverse matching" as matching triode 1 of tube 1 with triode 2 of tube 2, and triode 2 of tube 1 with triode 1 of tube 2.
I don't understand why they use this topology in their amps, it seems like it would be easy enough to straight match the sections (just a matter of which pins on the tube socket are used by which circuit).
The sonic benefits should be the same as for any other preamp matched tube situation - better interchannel balance and distortion characteristics.
Details at: http://www.thoraudio.com/Tubes.htm
I don't understand why they use this topology in their amps, it seems like it would be easy enough to straight match the sections (just a matter of which pins on the tube socket are used by which circuit).
The sonic benefits should be the same as for any other preamp matched tube situation - better interchannel balance and distortion characteristics.
Details at: http://www.thoraudio.com/Tubes.htm