2A3 Tube Opinions

Arthur,
A good source of NOS/used quality 2A3s is Vacuumtubes.com.  They have single plate,dual plates, dua filaments etc.
Charles, 

Hi Arthur,
I must admit that I find your system and various amplifiers oh so interesting 😊.  Does your Found Music 2A3 amplifier drive the Tannoys full range? What a sonic  (I assume) contrast to the esteemed Dartzeel amplifier. You must be having a ball. I love the EML XLS 300b in my amplifiers. 
Charles, 

I agree with dekay and larryi in that rolling the input and driver tubes would likely be an  effective tatic. Arthur which amplifier do you listen to more often given your terrific choices?  Do you use the Thoress preamp with all of your  power amplifiers?
Charles,

Hello Arthur,
 The Sophia Electric 300b has earned a reputation for excellent sound quality, natural is a word often used. It sounds as though your SET amps are driving the big Tannoys pretty well based on your comments.
Lets see, Thoress 845, Sophia 300b, Found Music 2A3 and  the SS Dartzeel.
No doubt you are enjoying audio bliss!
Charles,

Arthur, 
Regarding el 34 amplifiers I heard a Jadis this year at Axpona and it was "very" good sounding. I'm partial to SETs  but I could certainly be happy with the Jadis given what I heard.
Charles,  

Hi Arthur, 
I didn't mean to exclude the Line Magnetic amplifier.  I was under the impression that you had sold it. You don't have an "issue" just exceptionally  good taste 😊.  Selling the Dartzeel is a bit of a surprise. 
Art, when Jeff Day (Positive Feedback online) reviewed the Sophia 300b SET he was using the same speakers as you.  He was absolutely giddy in his praise of this pairing. So I can understand your enthusiasm. 
Charles, 

Arthur, 
It was el 34 tubed integrated amplifier (not a dedicated power amplifier). So this likely isn't their top example.   Regardless, I can say unequivocally that the Jadis made music if you know what I mean. 
Charles, 

Hi Larryi,
In general terms I understand that the 45 tube has a tighter or more  controlled bass reproduction than the 300b.  I've also have discovered that there's a spectrum of bass performance across different brands of these tubes. I can confirm this having the opportunity to hear 11 brands of the 300b in my amplifiers. 

Furthermore the bass quality of a 300b SET amplifier varies quite noticeably depending on make and model.  There are a multitude of choices in regards to this genre of amplifiers  (as I am certain that you know this). I've always respected your opinions and listening perspectives.  Concerning the Sophia Electric 300b amplifier I haven't heard it but via word of mouth and reviews it's said to be very good sounding (They offer various levels of this amplifier based on output transformer selection).  It apparently is an exceptional  match it seems with Arthur's Tannoys. As is always the case in these matters YMMV.
Charles,