Preamp Output Capacitor: Mundorf Supreme vs. Supreme Silver Oil

With my Rogue audio m180 darks they are traditional push pull transformer based tube  amps. I have tried both options, with and without bypasses. The coupling caps in my amps are 2.2 value and sound more open with greater extension and air with .22 value bypass caps added to the circuit. Without them it is more midrange oreintated and darker sounding. The treble stills sound clear and clean with good recordings, on my Revel 228 be speakers on the Chet baker "Chet" reissue you can clearly hear front  to back separation and his lips pressing against his horn without smearing, you can literally hear the brass instrument. Very clean and high resolution.  

Audio research uses bypass caps and their products sound amazing. It must come down to personal preference. 

And that's why it's a personal preference, in my system bypasses made my system sound more real, not less. It has nothing to do with fake hyped detail. 

Exactly Ralph, my Amps use four 2.2 value caps per monoblock, one for each tube. When running just a single large cap the sound is definitely shelved off in the highs, scymbals sound rounded off for an example. Adding .22 value caps opens the amps up, while still sounding very clear and clean, it just adds some sparkle up top making the system sound less dark.