Powerful Push Pull Triode Amplifiers

Yup, how about the VTL 450?

I tried the 450 in tetrode mode and I much preferred the Manley 250. At the time, I didn't know that one could switch between triode and tetrode on the VTL.

Shoreline makes some very fine, but also very expensive (not as expensive as TRL) push-pull 6550/kt88/90 based triodes. Some folks think they are the best of the super power tubes...I couldn't say.
I also remembered the Wavestream Kinetics V-8's...not sure of their power rating but they were designed to drive difficult loads.
I also have a pair of the MFA 200d's (same designer as the V-8's) and they are excellent as well.

Another question: at 250 watts, are the Manley 250 Neo-Classic monoblocks the most powerful amps using EL34s?

-Since triodes were mentioned- we make a 500 watt triode amp:

http://www.atma-sphere.com/products/ma3.html