In my quest for tone, I've designed and built several push-pull amps (6V6, EL84, 7868 and 6AK6 output tubes), and have tried several types of coupling caps (orange drops, Mallory yellows, paper-in-oil, teflon and vintage). My latest build is a 1 watt single-ended 6AK6 amp that I call the Tweed Mini Champ. I think the sound is absolutely fantastic. Here are some clips using a Samick Les Paul copy with DiMarzio Tone Zone and the PAF Pro pickups (no effects). http://www.naturdoctor.com/Chapters/Amps/Sounds/MiniChamp/Breakdown.mp3 http://www.naturdoctor.com/Chapters/Amps/Sounds/MiniChamp/Superman.mp3 http://www.naturdoctor.com/Chapters/Amps/Sounds/Fanton1.mp3 I also have a push-pull 6AK6 amp that sounds great, but it's not as dynamic as the Mini Champ. http://www.naturdoctor.com/Chapters/Amps/Sounds/DynaMite6AK6_1.mp3 http://www.naturdoctor.com/Chapters/Amps/Sounds/DynaMite6AK6_2.mp3 Here's the web pages for the amps http://www.naturdoctor.com/Chapters/Amps/MiniChamp.html http://www.naturdoctor.com/Chapters/Amps/DynaMite.html I've heard that single-ended amps are more dynamic, and that push-pull amps have that "big" sound. This does seem to be true with my prototype builds. Have you found this to be true, or does it depend on the amp?