Capacitor

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.  

 " the Duelund CAST Cu(Sn).  This is the best sounding capacitor ever produced in my opinion"

I'm not in a position to declare it the best sounding as I've not heard all upper tier competitors.  On the forums I see from time to time comments critical of the high cost of the Duelund CAST Copper foil capacitors. Some audio products are overpriced and overrated relative to  similar quality alternatives. 

In my humble opinion Duelund CAST is not overpriced.  In this instance you get what you pay for.  In fact I consider them a value choice because I believe that their performance level is that noteworthy.  As I've said before in regard to them, they are worth every single penny charged for them. A superb sounding product. If you can comfortably afford them, buy them. There will be no looking back. 
Charles