Your single favorite component

An Atma-Sphere UV-1 tube pre. But not just any UV-1...this was the original prototype. It is hand wired point to point and signed by Ralph Karsten and marked as serial #1. Besides the great sound, the uniqueness really appeals to me.  Truly a one-of-a-kind.    Not to mention it's a tube rollers dream.  Lots of vintage 6sn7s at reasonable prices. 

WOW, that's a tough question to answer, but I recently replaced my Paradigm S8V3 speakers with Wilson Watt Puppys, and just love the difference that they have contributed to my sysem

Ok, this will seem strange. I love my entire system which I researched and purchased mostly here on the 'gon. My favorite piece however is my new equipment rack. I purchased the rough sawn hard Maple from an Amish sawmill and then a friend of mine who does high end woodwork allowed me to help him build it in his shop. He showed me how to perform tasks using various tools and throughout the Winter we completed the four shelf 48" wide, 20" deep rack. Each piece was rough sanded by machine and then I hand sanded them prior to finish. You can't help but love a component that you helped to create. It looks awesome! 

New to the A-Gon' but appreciate reading everyones blog posts.  Ive been enjoying my little David Berning tube MicroZOTL HPA!  Is fantastic

It is a 1950's Valvo Cca 6922 Pinched Waist I acquired a couple of years ago.  It is in a (now antique) Audio Research LS2B MKII remote preamp.  Has long ago been a tube roller (roll em in and roll em out) to get to Grey Plate Cca 6922 Siemens & Halske  as the dream of the crop for this pre....   so far removed from that OE Chinese drek....  but this again moved performance to a whole other level.  Just add a finned tube cooler modded with a drain wire to ground to kill some additional RF and there you go.