Upgrading specific components in a tube amplifier

@hilde45 

"Make improvements of a sufficient degree that I can have moderate confidence there is now better sound."

I agree with the sentiment, for the exactly same reasons. Especially as the "improvements" become more subtle. 

I tend to live life the same way.

Make good life choices and you'll live a longer and happier life.

Exclusive Audio of Japan says this about the Yamamoto VT-52,

"The capacitors and resistors used are carefully selected from all over the world with the best sound quality selected through auditioning"

Is this the insides of the amp you want to make cap changes to, and why again?

You're looking at adding quite a bit of silver with the Audio Note components you specified in your post. I'd expect this may thin out mids, bass, less warm presentation. I have no issues with silver, just needs to be balanced with copper. On the other hand if existing presentation excess warmth or dark sounding silver could be just the thing.

Many nice caps out there including the Audio Notes. My favorites are the Duelund Cast tin plated copper. Also very much like Takman carbon film, some like the metal film. My favorite for max resolution/transparency are Texas Components TX2575 (nude Vishay). I'm using both the TX2575 and Cast caps in my 300B monoblocks.

Should have statedTakman and Texas Components are resistors. Tubes can make a large difference as well, especially power tubes.

Thank you all for all of your insights.

I have read numerous articles, reviews and threads on various forums that confirms the high quality of Yamamoto and I don't think at all there would be a reason to change anything at all. It was just a thought experiment to get an idea of the possible outcomes of changing components as capacitors, resistors and tube sockets. 

You're looking at adding quite a bit of silver with the Audio Note components you specified in your post. I'd expect this may thin out mids, bass, less warm presentation. I have no issues with silver, just needs to be balanced with copper. On the other hand if existing presentation excess warmth or dark sounding silver could be just the thing.

This is quite interesting. It seems that a lot of people strive for an all silver situation in Audio Note forums, but somehow I'm starting to believe that silver might have a too bright, clean and neutral resolution, whereas I prefer a much more deep, flavorful and colored sound (without it being too dramatic, rather more natural and romantic if one can say that).