Do you start fine tuning the system with cables or tubes ?

"Better NOS vintage signal tubes should last 5000 hours or more, especially from 1950s and military/industrial grade. Some vintage power tubes can also last for thousands of hours."

This depends upon the unit/design the tubes are being used in...

Certain designs from popular manufacturers are known "tube eaters" (CJ, AI & AR come to mind, but there are others as well - like Cary/Carey? and SF).

DeKay

DeKay, of course.

@audphile1 

"And dumping money into tubes with today’s prices, you are more likely to get better ROI out of component upgrade."

You're talking in absolutes; I just don't see it.

Nor do I. You get the most out of your system without major upgrades and only then move further if you are so inclined. But not $5k tube set for $3.5k integrated, no, that would be too extravagant, I got $1.5k tube set in it.

@inna 

"Nor do I. You get the most out of your system without major upgrades and only then move further if you are so inclined. But not $5k tube set for $3.5k integrated, no, that would be too extravagant, I got $1.5k tube set in it."

I just prefer to keep it stock and true to the designer's intent.