I have had a quad of these for years in a triode connected HiFi amp. They sound good, well over 2000 hrs on these in a demanding amp, and while two of the tubes are getting weak and have some warm up noises, they still do the job as long as bias is set appropriately to compensate.

Admittedly I have not tried any other EL34 in my amp, but I have done a buttload of research and listened to way too many sound clips.. and my verdict was that when using power tube crunch in a marshall-type amp, these do great at giving you the tones of old. Reminds me of Angus & Slash.. not a lot of lows, just really epic mids and highs. Not harsh, but just solid classic rock. If you plan on keeping the power tubes clean in your amp setup, it really doesn't matter as much because before clipping power tubes tend to be pretty similar no matter the tube.

in my marshall super lead plexi these tubes are the best of the current production el34 period....they cut a bit of the high treble marshall are known for and they are very rich in the mid territory...the perfect tube for a slp

For all the tubes in this price range that I've tried, these lasted the longest and sounded the best. I recorded with them for 4 years cranked to 10 in my Marshall (attenuated) and one finally went on me last a month ago. They gave it up like a good girl right until the very end. Ordering 4 more when I'm done writing this.

For me the magic combination for the tone I'm going with my Traynor YCS50H for consists of Shuguangs in the preamp, a Svetlana 12AX7 in the PI(splitter) and Svetlana EL34s in the power section. Crunchy high gain Marshally goodness.Very articulate and tight. Tonal nirvana!