Most powerful and popular EL34 tube amp?

The Copland 504 is a great amp. 50 watts is the rating but it will do 80 easy. It was 5000$ new in 2001. I own one. 4 KT-88,s or 6550,s

Manley Neo 250's. 10 el-34 per channel give you 250 watts per channel

You want the 'most powerful' EL-34 tube amp?
Take a look at the VTL Wotan BEASTS!

You can run el34's in the audiovalve challanger 180 monoblocks and get 150 watts of class A power;install 6550's or kt88's and max out power at 180 watts;this amp drives my soundlab m2's extremely with the 6550's and kt88's as I have not listened to the el34's as of yet;Bobby of Merlin was quite interested in this amp when I asked him the question if any of his customers were driving Melin's with it.

Here is a picture of the Tyler Acoustics room from the AK Fest in metro Detroit this year showing what amp he uses to demo his speakers. Its a Jolida JD-1000, 100 watts per channel EL-34 available used for around $1200.
http://live.audiogon.com/i/akf2010/h/1273523485.jpg