Capacitor


Dear friends I am interested to upgrade my caps in the tube preamp from Audio theta tin foil 3uf200VDC to Miflex1uf 240VDC copper foil what are your thoughts will reducing the value to 1uf affect the bass and frequency response or should I go with a higher value than 3uf  
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@bpoletti 

Changing even a single component ( pairs in this case - left+right channel) can, and does, make a huge difference in sound. In many cases more so than going from bad speaker cable to good ones.

There is no "design flaw". A good analogy would be a motor car getting a new, and much better, tires. The car is still the same, but a good set of tires can increase mileage, shorten brake distance, improve handling and make the vehicle safer. Same for an amp. It still the same great amp as before but it's a little enhanced, a little improved.

It costs a couple of $100 to upgrade caps vs. the tens of thousands new pre - amps will cost. New pre-amps, which incidentally will have the same or similar mediocre capacitors we are replacing in the Canary pre amps; meaning we'll be back at square one looking to upgrade capacitors in our new pre amps.
If by signal he means they are on the RCA outputs, then yes you can change. Don’t change the value of interstage coupling caps. 
@pauly
You are absolutely correct there is a brand I do not want to name he has 3 line stage the basic, enhanced and super enhanced and the only difference is the parts used but the price is almost 40% more in each step up 
@grannyring 
In my shoes what would you choose for correct tone timber and transparency
the Odam or Duelund  
If money is no problem and they fit….the Duelund CAST Cu(Sn).  This is the best sounding capacitor ever produced in my opinion.