Ok, so no one has a suggestion for you. Stop bumping it.
Do you want portable or AC, glass or solid state? Do you want something that is paint-by-numbers or something where you have to think? Do you want to do math or want the math done for you? Do you want something you can complete in an evening or something that will take months just to get the parts from 3 different countries? Do you want something you can do 100% from the article or something that's gonna require a thread or 10 to get by with a little help from your friends?
Note that the Szekeres you mentioned is only a current amp; no voltage gain. It'll actually have slightly less volume than no amp at all. Without a gainstage, anyway. For 580s you want voltage and don't need too much current. (Although Tomo uses a Szekeres w/o a gainstage at times with his 300 ohm Sennies, so it depends on you)
Do a bit of research, decide what you're willing to tackle and what you're not (like that every AC powered amp project has the capability to kill you quite easily if you disrespect it, and tube circuits run very high DC voltages making them that much more dangerous)
You can narrow things down by complexity, danger level, price, availability, etc... in the process your next project will jump out at you.
I know, not very helpful.
Ok, build KG's pushpull 1815/1015.
No? Maybe BJ's Kumisa?
Check out that link that jphone gave ya, pete is making the board files available for a opamp/buffer amp...
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paul, it's not gonna happen. Said so in the #42 post. It's a datasheet implementation crossed with a cmoy crossed with stupidity. There's no
reason to make a schematic for it.