Quote: Thanks for your reply. Have you tried replacing them? Other than less gain, do you notice any differences in sound? 

Quote: Meaning I can replace the 12AX7 with 12AU7 or 12AT7 without any change of setting?         Coud you kindy share what are the differences with replcing the 12AX7 with 12AU7 or 12AT7? 

I also bought a Furutech fuse last night for my Leben CS300, and I agree that it immediatley takes the Leben's refinement to another level!!    It has not even been broken in.  

Quote: Pure madness!  

Which Furtech fuse are you using? 

Quote:   Any improvement on the sound after changing th socket and fuse? 

Any improvement on the sound after changing th socket and fuse? 

Oh yes. A typo.

My initial choices of capacitors are V Cap TFTF or REL AudioCap RT Polystyrene Film & Tin Foil. Duelund is simply out of my reach.      Shall I get 0.33uF 600V or 0.47uF 600V to replace the four coupling capacitors of my Leben CS3000?  

Sound promising! I'd also like to give it a try. Has anyone tried to replace the output transformer? 

I read the same article also. That's why I am curious to what extend can these modifications improve the sound quality.      Here is the article:        http://www.highfidelity.pl/@main-135&lang=en    

Hi everyone, I got a Leben CS300 and am wondering who has tried to modified it and what are the results.