Do all tube preamps leak DC?

Hi Paul,  you could have called me on the phone with these concerns,  however,  I see Eric_squires  has answered you as thorough as I would have,  cheers. 

Hi Paul,  3 years ago Ralph Atmas-phere convinced me to open up my tube/solid state hybrid digital player that I run directly to my modified krell 700cx amplifier to prove that I had no DC leakage,  as a matter of fact, I have two coupling capacitors behind each tube,  krell once accused my player was the fault of on going problems with my amplifier,  it took Dan D’Agostino himself to tell me by speed dial on my phone to share with me what was actually wrong with my amplifier after modifications,  it was two heat sensors on the left side of the amplifier,  the amplifier has a total of six,  three on each side,  when I told krell how to fix the problem with the amplifier,  they wanted to know how I knew that,  of course I could not divulge who told me,  any way,  Ralph is a good friend of mine,  when it comes to this subject here of DC leakage,  I learned every thing I know on the subject from him,  I assure you Paul,  you can take what he has said as the gospel! 

Paul,  have you taken the hood off the Audible illusions l1 preamplifier to visually check if you have coupling capacitors located next to the tubes?, and check the condition of the capacitors?, also,  I would ask Ralph here how to check if the specifications are up to par on the coupling capacitors even if they pass the visual inspection,  sometimes capacitors dry out,  or are just to old,  if all this passes,  I believe you have no worries of DC,  however,  if the capacitors fail any of the mentioned here,  I would replace before proceeding,  cheers.