Sofia Electric Blue 6SN7

An update about these tubes after almost a year of daily use:They seem to have lost the beautiful tone I was so thrilled with initially.The vocals especially became increasingly harsh.Of course I didn't suspect the Sofias and began switching out other tubes with no luck.Yesterday I swapped in a Sylvania in the amp and it was instant relief.Dang.Next were the two in the pre.
So it seems they were good for about nine months/-500 hrs and began to decline slowly.
The Sylvanias are ok but a little congested in the midrange.I've got three pairs of different NOS tubes on the way to try now.

Will do brownsfan.

jmolsberg I am using Sylvania 12AT7 and the original Tung Sol SN7.I think the Sofias would sound excellent in the M2 but it's working so well in the amp that I have no desire to try them now.But I will give it a try anyway this weekend just to satisfy both our curiosities and let you know.One caveat is the Sofias are quite a bit taller and would require a new lid  from LTA to accommodate them.
I tried the Sylvania SN7s - too veiled,JJs - meh,EH - hyper detailed.The Tung Sols don't do anything wrong,but they don't have that sweet organic midrange and seem too polite?congested?un-dynamic?

@winoguy17  thank you!

Very cool Wig!Please post your impressions when you get the WE KT88s up and running:)

@jmolsberg I went ahead and swapped in the Sofias in the MZ2 last evening after reluctantly putting the Sylvania back in the driver socket of the amp.In that configuration the sound took a giant leap forward that caught me totally by surprise.I put on one of my favorite cds Hot Tuna - live at new orleans house in Berkley and started to leave the room to let the system warm up a little while I finished cleaning up the kitchen.Holy shite!!Three hours flew by while I kept saying gotta listen to this and this and that and just one more......So what was so startling is the soundstage immediately deepened and increased in width,the lower mids/upper bass warmed up but retained detail,the instruments and vocalists seemed to 'solidify'and give the illusion of better three dimensionality.The transients weren't as razor sharp but the sound was never syrupy or tubby.The timbre was gorgeous.Detail + Beauty.Dammit now I want to try one in the amp again along with the two in the MZ2.If that works out then I'd need three more for back ups.This is your fault jmolsberg;)I might have to try the Pvanes at half the price.

Today I enjoyed the following and could find no fault with any genre:
John Mayall +Bluesbreakers - Silvertones
Blood Sweat Tears - Greatest Hits
Joan Baez- Ring Them Bells (live)
Neil Young - Unplugged
Jethro Tull - Aqualung
Otis Spann - Good Morning Mr Blues
Steve Earle - various downloads
Recording of my son singing and playing guitar

Apologies for being overenthusiastic.I'm not associated with the company at all,just another happy tube nerd.I hope the Sofias will prove reliable over time and I'll update periodically.
 

I received another pair of the Sofias to try one in the driver tube position of the Aric Audio amp.Turns out it was too much of a good thing,lol!The sound became overly euphonic which was so pretty, especially on sax and piano with the added harmonics.But it was really too much.That's ok since I like having back ups.Today I swapped in a EH(which I'd thought hyper detailed) in the driver socket.Beautiful and refined!So the LTA is keeping the Sofias and a new lid to accommodate the taller tubes is on order.
So the final set up is:LTA MZ2 two Sylvania 12at7,two Sofia Blue 6SN7
Aric Audio Transcend Push Pull amp one EH 6SN7,two Sylvania SN7,four Tung Sol KT150

I'm glad you're liking them brownfan!
jmolsberg:)

Best of luck brownsfan.You have quite a few tubes to mix and match before hitting on the ideal combo.