New try out of a 6BM8 schematic found on an Australian website.
This amplifier is performing very good, great frequency response from the lowest lows tot he highest highs. Surprised about the power output, nearing 3 watts per channel this amp can go loud!
Finished this one today, so I'll need some more time to get a proper verdict about it's sound quality... but I didn't expect it to sound this good.
Valvo ECL82 with 233V across the tube.
Music fragment taken from 'Biosphere', 'das Subharcord'.

EDIT:
Per channel the ultra linear tap of the output transformer is connected to the 2nd grid (via a resistor) of the pentode in this case. The use of global feedback takes care of the distortion of this amplifier.

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