Probably Cary 805C, 50 wpc..........
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Wavac has a 100 watt mono block SET amps. They are the most beautiful amps I think I have ever seen. Might be one of the best sounding I have heard. Wavac also has a 50 watt SET amp. Hi Marakanetz, Cary has a V-12 amp that is 50 watt triode or 100 watt ultra linear. The Cary 805 is not a push pull design. There is another SET amp that puts out 50 watts but I can't remember the name of the company.
The Bel Canto SET40 is 37 wpc with the 845 output tube.Thought it would meet my needs power wise with that amount of grunt but it didn't so I need to flip it.My sepakers are 93 db sensitive but maybe they have an impedance dip or maybe I just need to clean the wax outta my ears.I was supprised though.
The most powerful SET amp I know of is the WAVAC HE-833, which is a 100 watt monoblock. That's almost twice the power of the Cary. At least one person is using this beast to drive his Sound Labs, which means the amp is quite capable of driving a very difficult load. The price is in the same ballpark as the Cary. Replacement 833 monster output tubes are quite reasonable - around $250 each last time I checked.
Here is the address of WAVAC's HE-833 page: http://www.wavac-audio.gr.jp/he833_e.html
The Cary (and presumeably the Bel Canto) drive the output tube grid into class A2 which significantly increases grid current and distortion. However, it isn't intended to stay in this mode of operation except for extreme dynamic peaks. Normal operation is class A up to around 25 watts as Ed pointed out.
Along with WAVAC, Legend Audio also makes an amp using the 833 tube with at least 100 watts (possibly 200?), but I don't know if it is actually a product or just a statement item. Wyetech has 45 watt SET mono-blocks, though they use two complete amp channels in parallel to produce this kind of power. Also, the company deHavilland makes a SET mono-block with the Russian GM70 tube that is a solid 30 watt.
Of course, there are those who feel that anything over 10 watts SET requires too many sonic compromises, but this will force the use of very efficient speakers. Hope this helps.