They do NOT get better as those ancient caps age. Not by a long shot. I've recapped all of the old Marantz units I've got. The tantalum caps on those like to pop like firecrackers and take out tuners. Electrolytics go leaky and push bias out of spec, leak DC onto signal paths, and eventually destroy transistors and resistors. I don't know why people think these old things sound so dreamy operating way out of spec and sounding nothing like they were designed to. Beyond all that, the glue Pioneer and Sansui used decomposes and eats the braces off the boards and the legs of the components. And no, they don't measure well. And if that's not enough, they usually have excessive DC on the outputs that does no favors for your speakers.
Magical Marantz 22## receivers
Why is it generally accepted that caps in a vintage speaker crossover should be replaced but some how these mid-fi (at best) 70’s vintage receivers seem to get better (and more expensive) with no maintenance. I would love to see someone bench test one of these beauties with the “tube like” sound.
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