That was very much a serious amplifier and you are fortunate to have them. I just lost 2+ hours trying to find (what used to be easy to find 20 years ago) info on the thing. I still haven't found Ron's circuit, but perhaps someone who built one will see your post in time. What I remember is that Ron and Jack (Electra-print) worked together to hatch that thing based on Jack's 45 DRD circuit. Jack spent a bunch of time finding input tube operating points that were complementary in distortion to that of the output stage, and the magnetics are all custom, all first-rate and wont be wound again (Jack retired). If there is specific information you seek, it may be gone unless you are lucky enough to correspond with the right person who perhaps built a kit. I've never seen a gutshot except yours so I can't say from the pics (thanks for those, BTW) if that's Ron's work or not--perhaps other Welborne owners may comment. It looks minimal because it is minimal--and you may be sure it was quite well-engineered for the given set of goals. IMO, that's the zero-NFB SE config to do the least damage to signal on the way through an amp--but it needs a pro winder with fast test gear to keep all the parasitics well out of band (and as an old RF guy, audio was/is slow to Jack). Personally, I'd expect the listening report to be as yours sounds (thank you, also, for that)--clear and more sparkle, basically. I'd expect the harmonics out of that thing at 5-700mW or whatever you feed Lascalas to be very much different than many other low-watt SE amps. As zero NFB SE amps go, a direct-coupled amp _should_ be cleaner. My opinion only, but something like that is about as good as it gets for low-watt zero-NFB SE amps. Twenty-some years ago, kits were $1100 +/- 200 a pair, depending on options/wood/tubes/caps/blah blah...I remember because I didn't have the $1200 then Congrats. This was Jack's, but I _think_ (?) Ron's is supposed to have a 6N1P input tube.