Well......here are a couple of threads that are PP-UL KT88, 4.5 K output trans 60W but are using negative feedback. If you wade through the posts, there was discussion about using 6DJ8/ECC88's here and there.
They are both based on the Mullard 5-20; the Opus uses MOSFET followers for additional goodness........
http://www.diyaudio.com/forums/tubes-valves/156699-mullard-5-20-kt88-pp-blocks.html
http://www.diyaudio.com/forums/tubes-valves/161702-opus-5-0-modern-mullard.html
They are both based on the Mullard 5-20; the Opus uses MOSFET followers for additional goodness........
http://www.diyaudio.com/forums/tubes-valves/156699-mullard-5-20-kt88-pp-blocks.html
http://www.diyaudio.com/forums/tubes-valves/161702-opus-5-0-modern-mullard.html
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