I'm not against tubes just " per sé ", no things are that I learned by my self that tubes can't honor what's in the recording grooves in better way than SS. This technology has and is extremely limited for today standards and with your Q3 just can't do a decent work.
Now, no SUT can compete with good active SS design, even those SUTs with high price tags over 7K can't do it. Physics laws can't be changed, not you, me or any SUT designer.
But forgeret what is inside the SUT box and think that the delicated and I can say extremely delicated and very low output cartridge signal instead to go directly to the circuit boards ( as in the 326S. ) that's the shorter " road " for that delicated recorded information that is what that signal needs: shorter road to suffer the less degradation trying to preserve the original recorded information pick-up by the cartridge.
Instead of that in your system the signal not only has to pass through " hundred " of meter in both SUT transformers and from there must pass for other degradation link that are the SUT output connectors but inside this output connectors exist a piece of solder for the inside cable that goes to those connectors and YES this piece of solder and the additional output connectors where that signal must pass following degrading the signal ( not only at both frequency extremes but over all the frequency range . ! ! ) then from these output connectors the signal goes inside the IC cable male connectors with that cable solder where the signal degradation continues the heavy endless degradation but thing does not stop here because the signal has to travel over that IC cable followed but the output IC cable and on and on....
Btw, your unipivots are a little diferent from the VPI.
Your supertweeters only destroy the sound of your system and I know it by experience because I use it many years till an speaker expert designer explain me the problem but your q3 goes to 50khz and has no need for those Enigmas that its frequency range stops at 40khz ! ! and now you have two sources in very bad position working in part of the same frequency range: tweeters and sperT ? ? ?
In the past I recomend to you to integrate your system two self powered subwoofers due that the Q3 crooosover the midrange at over 300 hz.
As you can read many problems in your system and that's why you can't detect all the " errors " down there.
Btw, by coincidence I read this in relation to the Q3 ( I read it 5 minutes ago ) that coincide with my past advise on subs:
""" Seems to not like big swings in the low registers ..For that one may need to upgrade to the bigger brothers the Q5 or Q7. I am very partial to subwoofers as many know by now and would love to use this speaker with active crossover (Say the Lyngddorf) and crossed very high with a smooth slope say 6 dB/oct at 100~150 Hz... Just a thought.. """
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.