Your real question should be "Can I drive my Theil 2.2's with a modest sized tube amp?"
There is a great deal of interaction between an amp and a speaker. A speaker with minimal impedence drooping to or below 4 ohms are not good candidates for anything much less than a high power tube amp. A speaker with an impedence curve that has big swings (as opposed to being relatively flat) may not be good with most any tube amp.
But apart from that, assuming that your speakers are any easy load with an 86db efficiency I'd want at least 80 watts with tubes and 100 to 200 with most SS unless they were really high current amps.
Watts are watts. Tubes sound better than SS when they clip and its more subtractive. SS just sounds crappy when they clip.
There is a great deal of interaction between an amp and a speaker. A speaker with minimal impedence drooping to or below 4 ohms are not good candidates for anything much less than a high power tube amp. A speaker with an impedence curve that has big swings (as opposed to being relatively flat) may not be good with most any tube amp.
But apart from that, assuming that your speakers are any easy load with an 86db efficiency I'd want at least 80 watts with tubes and 100 to 200 with most SS unless they were really high current amps.
Watts are watts. Tubes sound better than SS when they clip and its more subtractive. SS just sounds crappy when they clip.