Should I eliminate my preamp?

I most certanly prefer my Audio Research LS27 to no preamplifier by far.  In fact if I play my 35 year old or so Stax headphone system thru the record out of mt LS27 instead of the audio source directly in the audio reproduction is extremely better thru the tube LS27.  It is not just a minor improvement in sound quality.  Whatever audio source is used, say even my OPPO 205 as well as 105, the addition of a fairly recent Audio Research tube preamp will be the best choice.  By doing so a quality close to40 year old Stax headphone system can actually compete favorably to some of the recent expensive planer magnetic headphones of today.  For a fraction of the cost.  That is what a true quality tube preampkifier can do for an audio system.  It is simply someting one has to try out for themself.  Recently Paul McGowan of PS Audio said the same on his own current top audio systems.

I have two different Stax Electrostatic headphone systems.  My Stax SRD7SB/Lambda system is driven directly by my Rega Osiris integrated using an OPPO 205 by a half meter pair of MG Audio Design ballanced interconnects.  I have also added a one foot pair of MG Audio Design speaker wires between the Rega Osiris and the connecting wires of the Stax SDR7SB box for added fidelity.  My other Stax system is an SMR1-MKII/Lambda hooked up by again MG Audio Desgn single ended interconnects to the record out single ended outputs of my Audio Research LS 27 preamp.  Bothe systems, even though the Stax units are all about 35 years old but I have a sound reproduction from both of them can compete favoribly with much of these current top end regular headphone based systems.  Of course if I had the latest top of the line Stax headphone system and could run them into my LS27 ballanced it would be another story.  Oh yes, I use an OPPO 105 for my Audio Research LS27 system, which I use on my Martin/Logan speaker system.  The Audio Research/Stax SMR1-MKII total tube headphone system verses the complete solid based Rega Orisis.Stax SRD7SB systems both have different pluses and minuses>  Overall I prefer solid state 160 watts per channel Stax/Rega sytem for rock and roll, with the tube based Audio Research/tube based Stax system for everything else.