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

Can be lower risk and higher reward when high quality-upgrade replacement parts of exact same specs are used and installed by a competent tech.  

Watch a Paul M video from PSAudio where they fully acknowledge even their higher end gear is all designed and built to a price point to control costs, keep pricing down, increase profitabilty, not using overly exotic parts.  And, then sharing in their other design lab they build and upgrade experimental prototypes built with the best parts available to help determine what is truly possible to achieve the best sound. "What is now proved was once only imagined" ― William Blake

How about upgrading transformers?

Do QuickSilver amps have high enough quality transformers and they don't need to be replaced?

Hilde45,

I believe a call to QS is worthwhile. You tell them what you're looking for in sound production. Tell them your system. My guess, your room has as much to do with your dissatisfaction. That aside, QS will give you insights, regardless of getting their ego bruised. It's worth hearing their opinions.

You've received lots of opinions in this thread, which probably has left you with more questions than narrowed your choices for the right direction. I agree with your price point perspective. Lean on that with QS. "I'm assuming this amp was built to a price point, which makes perfect sense. If the price point was $500 higher, what would you have done differently with this amp to improve it, not essentially creating a new amp? Second question, do you offer these upgrades in-house?"

Those questions offer respect and acknowledgement of their intentions of quality. You also lean on them for their opinions and technical expertise. If they still get bothered, then you go elsewhere...I doubt they will.

Send me a pm here and we can talk more if you want.

Goodluck

I found a great improvement to my tube amp was to buy a power conditioner this made a big difference! I bought one for like $500 and it worked great!

I have benefited from other people who have had experience with asking them about this question. It is denied that anything needs to be improved and there is definitely a lack of sympathy for the question itself. 
 

the room is not the issue. The thread covers these things already.