Tubes in the car…

maaahlzeit, I just found this when I was browsing and I try to get my mouth back I didn’t know until now that there are also tube namps for car audio. did someone ever hear a tube in the car? if yes, what was it like? man, how would I like to hear such a part with the matching LS in the car… I think the linked amp should almost represent the optimum…or do you still know such crazy devices for the car? money you would have to have…