This is kind of being set up like a 'trap' of some kind... but I did an extensive listening test a few years ago making an el34 comparison and I could hear a difference in the same circuit.
They had some distinct differences that I could discern... but they were more alike than different.
The 66 and 88 were more potent and had a very forward mid's and the 34 were more laid back and significantly more balanced from top to bottom.
That was about it for me... like most things, none was right and none were wrong. They were different flavors
I mean, I wish I was learning something here, but I just am not... and I don't think most of the long timers around here with more than a couple thousand posts aren't either... but your effort is appreciated.
there is a lot of good stuff going on in Vietnam... when I was looking for some Jupiter cap's a few years ago (after they stopped making them) I found some in Vietnam. they came with zero issues.
My choice would be for a Tube of some kind... a 45, 2A3 or 300 is good.
How does the specific Heritage dispersion pattern require room treatment?
Are you speaking of the 'directionality'? If so, that is not inherently, or specific, to klipsch.
It's rather simple in terms of the Bass sound... do you prefer distortion or do you not?
One is not right, and the other wrong... they are merely different.
don't most newer model cars have hdmi inputs?
that would be a simple usb-c to hdmi connector, like you would use for a wall wart.
I've used 'boxes' like you showed above for somethings... they work reasonably well.