Charles1dad, I would say if Dpe's results were truly excellent, this thread would not exist.
Holding the variables you mentioned constant, the 2A3 tube will most definitely eclipse the 300B in terms of low end response and impact.
Taking the Lowther route, Isochronism's Beauhorn Virtuosos would be a better match for a 300B amplifier than the Hornings. Not to say that a 300B amplifier won't drive the Hornings, it most certainly will. But neither are you going to get to hear all of the speaker you paid for.
Dpe, yes, I did hear the Deja Vu push-pull 2A3 amplifier with Horning loudspeakers. I recently had that combination in my second system for a couple of months. Though I told my buddy (a fellow Audiogoner) who lent it to me to never sell it, I'd say if you are interested, he'd be willing to talk. It was the best amp I've thus far mated to my Hornings. Not sure where you are located, but if you're within driving distance of Philadelphia, most likely we can put the combination back together for you to come and give a listen to.
When I say crazy volumes, I mean 110 - 120 dB with both ease and requisite slam. My only complaint, you pay for some of that bass the solid state rectification yields by sacrificing a bit of tube rectification sweetness and romance.
Being a push-pull amp, as opposed to SET, its output was closer to 15 watts than 5. The much underrated 2A3 used in this configuration will sound a lot more like the typical 30 - 35 watt per channel tube amp, and the seat of the pants feel of the Deja Vu with the three loudspeakers I used it with was actually more than my Dynaco ST70, with some seriously meaty low end. 2A3 (2 - 5 wpc) SET amps will never come anywhere close in terms of power or extension.
