Happy to hear your comments about the JOR!
Knowing this Jadis amp as I do, I feel it eclipses the vast majority of what's available. Still, let's give credit to Dynaco, as that's what it really is. Amazing how most have traditionally looked down upon the "lowly" MKII, MKIII, ST70, and MKIV products.
All things being equal, I, too, prefer the sound of the 300B to the 845. I will add the 211 does give up some things to the 845, but also generally sounds better to me.
Probably the best high-end audio system I've encountered was the Audio Federation set up at RMAF 2008 featuring the $100K Audio Note 300B units. Though I returned several times through the course of the weekend, it's obviously difficult to truly judge an amplifier in absolute terms at a show. Representative of Audio Note products, the system was as close to music as I've come across in high-end audio.
Still, my overall experience has convinced me the mostly underestimated/overlooked 2A3 is a superior tube to the 300B. Of course, for SET the 2A3 does not provide sufficient power, and in that configuration, the 300B clearly represents the better solution. But in a parallel singled-ended (PSE) or push-pull (PP) amplifier, I'll take the 2A3 pretty much every time. The 2A3 provides more weight and solidity, superior low-end response, and a surprisingly natural midrange that can sometimes come across as a sweet tonality in the best sense of the term.
Though rare, you might want to investigate the Deja Vu push-pull 2A3. It's about as good an amplifier as you can find, and will drive most loudspeakers of at least reasonable efficiency. My one and only sonic (buildwise, it's a bit on the unrefined/unpolished side) criticism is that I wish it provided a bit more sweetness ala tube rectification. But were it to do so, it would surely compromise its impressively stiff and taut low frequency response. Outside of the Deja Vu, and at lower cost, I've heard several other push-pull 2A3 amplifiers that impressed me greatly,
