Interesting, thanks. I wondered if the 6L6 was used that way. And this has no driver circuit, so you must have a preamp that provides adequate signal? I'll try to have a read through the link you provided.The 6L6 is used in the power supply as a feed forward shunt regulator.
Thanks for the compliment. The preamp sounds great to my ears, although, I don't have a huge amount of varied listening experiences with tube gear. I am running a phone pre(Black Cube) into this preamp, and then out into a Marantz PM8005 (power amp section). It is plenty loud at about 1/3 ish volume and sounds as clean and clear as the preamp section of the Marantz. There is definitely something extra pleasing to the sound, especially strong vocals.Edit 2: OK, read it. While the 6V6 wants more swing to take full advantage (particularly as an output tube), this amp utilizes just standard 1-2v output of lots of sources. Pretty constrained on the plate curves. I've never done this so am curious how it sounds.
Anyway, the amp looks quite nice!