Tube Amp, Preamp upgrades -- what did you do that improved your units?

One time I had a Dynaco 70 redone and it was out so long that I forgot what it sounded like prior to the rehabilitation!

however when I re tubed a Primaluna amp and pre amp same day I could hear the difference!

Auditory memory!!!!

Major auditory gripe is that I listen to internet radio or Qobuz and the recording is what seems to change the listening experience!
ya can’t win!

My internet provider can only transmit what they get I assume! Mostly MP3 files!
besides I wonder if one can fully hear the difference between the various sample and bit rates ?????

I used to be v picky - loved the hi technology 

now , audio is a masker for tinnitus!

la vida es sueno!

As long as PSA is below 5 auditory distortion is a pleasure!

Thanks folks for the suggestions for foam panels, equalizers, rugs, new speakers, etc. I'm sure there's a wine to drink along with the listening, too. Still, I'm really asking a very narrow question here.

That said, it is a free country and typing is therapeutic.

Thanks, SNS. Spaciousness…the final frontier. Yes! I will likely do only caps. Looking at used market, changing caps seems minimally controversial to buyers. That said, I'm looking on keeping these amps for quite a while.