Can this be good first tube amplifier?

Try also Stabilant -22 Contact enhancer

Stabilant 22 is garbage. Can’t tell you how many electrical failures I’ve seen as a result of that junk - too many.

As for your barely coherent rant, not all expensive caps are good caps. There’s more to performance than choice of caps and resistors.

Having owned an audio store makes you an expert in what? I have a local audio dealer who knows absolute jack about making a system sound even tolerable, let alone good. Somehow he still manages to sell plenty of gear.

Tube rectification is not necessary to achieve the lush bloom and liquid midrange of tubes. Such claims are based on nothing but myth and conjecture.