Any direct comparisons between Decware SE34I.5 and SE84UFO2?

Can’t really help you except that you probably can’t go very far wrong with either.
I’m using the SE84UFO which is a gas to own. The tubes it uses are really inexpensive (I mean I just bought some for a little over a buck apiece) and so you can fine tune the sound to what you’re looking for. I haven’t gotten into tube adapters yet but that opens up even more possibilities.
If you think you can suffice with two watts the SE84UFO2 with all the mods should be a great amp.  If that isn't enough buy two and bridge them.  Basically the SE84UFO3 with meters.

I’ve owned the 341.5 for about a year.  I upgraded with all the options and I think the price was near $2500.  I chose it because it has a few more watts.  I’ve used it with Decware 945 speakers and a pair of custom made Lii Audio Silver 10 s.  My system also includes two REL subwoofers.  From the deepest bass to the highs, a real smooth performer.  Mid range is superb.  I prefer the Lii Audio speakers. Not being a professional reviewers, I can only say that everything we throw at it it handles. Best of luck choosing

Perfect examples of the amp I have is outstanding, but I haven’t heard the other one. I’m more appreciative than that sounds. I’ve just sifted through lots of individually superlative reviews.

I have found a very few direct comparisons on different forums, but since the amps also have nicknames (Rachael and SuperZen) and search engines generally return results by the page instead of by the post, it can get complicated to get the right combination of search terms and then sift through and find direct head to head comparisons. The results also depend on the speakers and room and the tubes and the music. General impressions I’ve gotten are that the SE34 is a little warmer and laid back, but makes up for it with more power. The SE84 is more dynamic and precise but can run out of gas (which makes sense if you’re trying for more volume than 2W can get through your speakers).

cat_doorman,
I own the S34I.5 "Rachel", it is all you need, due to 6 watts per channel.  Single ended triode amps uses only three internal elements inside of the tube, due to the way it is wired.  Lesser elements involved, the lower the distortion.  Also single ended amplifiers waveform does not pass the signal to another tube once it passes the 0 point.  Pushpull amplifiers usually operate where the waveform trades off signal to another tube once it passes the 0 point.  I run my Decware amp with the Decware CSP3 preamp,  Decware switchbox, and Decware ZP3 phono stage.  The sound is clean, powerful, and realistic. If you choose Deware lower power amps, just make sure you use higher efficiency speakers  for compatibility purposes.  Good luck.

I was ready to buy in pairs, so recently I got a TORII V and an UFO2. I’d say the difference in the case of these 2 is the power, 20 W vs 2 (I think). But the sounds are very close, and excellent in both cases. The UFO2 will work perfectly in a small - medium room with the right speakers, while the TORII V (and I assume the SE34I.5) could be used in a more spacious room. I also ordered both amps with the idea of sellingl one of them, but I think I may keep both. I switch between both and I enjoy the experience immensely, 2 masterpieces.

@jacano that sounds like exactly the scenario I wanted to avoid. I had almost made up my mind when I realized that rather than buying more different amps, what I really needed was a better preamp since I’m still using a Schiit Saga+. As it turns out the new pre I ordered is also an integrated amp. Might be interesting to compare a 1W LTA MZ3 to a 2W Zen someday. I never thought to look for that comparison. There should be a special word for a group of amps, like a gaggle, pride, parliament, clowder, or herd. Enjoy your growing collection.

I also ordered a switch box from Steve with two outputs and an A/B switch and I go from one to the other. I thought at first about selling the UFO2, but it is "only" $1300, almost not worth to sell it. But now (my room is small) kind of I even like the UFO2 more than the TORII. I don’t feel like selling this one either, because it is probably the first V made, so it is special in some way... So, in conclusion, yes, you did very well not buying both amps...

@cat_doorman maybe too late for you, but exactly the comps you were asking for are available here:

 

https://www.tnt-audio.com/ampli/decwarese34i_e.html

@joshwed

Thanks for the link. I think I did see this one, but it’s from 2002 so each of the models has gone through several upgrades since then. Now I think both amps use the same output transformers which brings the sound closer together than previous iterations. I think they’re working on orders from a year ago currently. My indecision added many months to my wait. I think upgrading my preamp was the right choice though. I was sure about that, and it made a bigger difference than switching between amps does. 

@cat_doorman 

Yeah....it is quite old and things have changed.  I'm considering putting an order into the queue--but then will also need a carryover since my current rig fried recently.

Have also been considering a dynaco st70 rebuild from Will Vincent.  Ever listened to one?

@joshwed 

My experience is fairly limited because I'm basically a hermit and only ventured into tube amps a few years ago. Another little Class A amp that a few people have recommended is Inspire by Dennis Had. There are probably a few threads about it or other amps he's designed over the years. He sells on eBay now.

https://www.ebay.com/itm/154825814217?hash=item240c5670c9:g:YA0AAOSwco1fV~aS