Audio Research Ref: CD8

I received my CD7 back from Audio Research yesterday. I listened to it last night, and then again this afternoon. Total "break in time" about 5 hours.
The difference from before the mod till now is:
Air. The sound stage and music are riding on air. On top of this when an instrument is highlighted in a band (snare drum, trumpet), or vocal piece (soloist) its like the performer steps up. I have not heard that quality before.
Also the level of micro detail is increased by quite a margin. In particular in the midband, and high frequencies.
I now truly believe Leonard was accurate with his statement that the sonic level improvement was large. Though I must say, overall it sounds like the midrange is boosted up slightly. Before I thought maybe the bass was too much.
My associated equipment is Ref2, D400 Mk2, Wilson watt/puppy 7.
The new tube; 5881 tube is installed horizontally, slightly forward, and to the right cabinet edge of the old 2 power regulation tubes. The older power regulation tube holders are "capped off".
Audio Research also ensured my unit was fully up to spec (turn on mod), greased, lubed the transport.
Again another very satisfying experience from Audio Research.
I am not a dealer, not in the audio business, nor associated with Audio Research in any way.

Wsill, how long did it take to get the mod done? From the time you shipped to the time you received? I am trying to figure out if it could be done in time for Christmas yet.
Thanks.

Tlg. Audio Research turned my unit around in 3 weeks. Door to door.

Wsill, you say it is a sonic improvement but also midrange is boosted up. Do you mean the new machine is more aggressive and forward sounding when compared to before mod? I am trying to figure out whether the new version has a different sound presentation significantly different from the original one. Then it will also be a choice of taste etc.

No, what I am saying is. My CD7 was somewhat lifeless even though I had the replaced tubes. Now my CD7 with the power supply mod is:
The sound stage and music are riding on air. On top of this when an instrument is highlighted in a band (snare drum, trumpet), or vocal piece (soloist) its like the performer steps up.
I do not believe the overall tonality has changed. The midrange is now alive with more detail (not harsh, not aggressive). It just somehow sounds flatter.
For me the improvement is quite remarkable.
I realize it's hard making decisions like this to mod a component, I took the gamble based on Leonards advice, and the sound that my CD7 had. I am estatic over the improvement. I do not know if ARC would characterize the change I hear as what they would expect.