Who, do you think, designs the best looking tube-based devices?

Classe and Macintosh and Dynaco

Like some Art Deco, Electronluv is designed for museums.
And worthy of them! I will never learn how they sound & wonder
if anyone even cares.

.mastersound 

Vinnie Rossi L2i Signature Edition integrated. 
Out of my price range, but I want it.

To Me?
In this order:

Audio Research
Luxman
McIntosh

Ahh, Emotive Audio. Beautiful.

See! Tol' ya so!

Raven Audio Reflection MK2

Aries Cerat.
Any product, including DACs

The best looking tube gear in my opinion is made by Emotive Audio Design.  The Erato and Epifania preamps especially.

It’s not everyone’s cup of tea but Decware makes some good looking gear as well as Line Magnetic. 

I really like the design of Audio Research top tier line stage & amp. Additionally LTA. Can’t recall the name of the pre that is used to test for Devore Speakers though it looks brutal in a flattering way. 
Everything else mentioned prior. I agree whole heartedly. 

I like some of Don Garber’s (Fi) practical/sculptural designs as well as a couple of David Berning’s older "window display" models.

Also like the plain look (no exposed tubes) of the company (forget their name) currently manufacturing amps based upon David Berning’s less expensive designs.

Though SS the Dayens’ Amino amplifier reminds me of the amps mentioned in the above paragraph.

I liked my early Audion Silver Night 300B amp for it clean understated (half width) looks.

Eva Manley has manufactured some unusual (great looking) gear, but she’s into vintage/modern motor bikes, from what I gather, so I wouldn’t expect anything less.

VAC (Eva’s Ex?) also had a fully caged integrated (85 something I think) that I found attractive.

Aside from the plastic knobs (didn’t fare well over time) I like the later Dynaco PAS preamps with silver faceplates, SCA-35 integrated and the FM3 tuner for their clean/classic look (no need for exposed tubes).

Also, the Marantz 8 (with white dial meter) and Harmon Kardon’s II and V amps come to mind.

Hovland (who is local to me) has a very, very good eye, but the addition of Blue lights killed it somewhat - for me anyway.

Leak and Quad also produced attractive vintage gear.

The tube gear in my setup is awful looking, but as it’s located on the other side of the speaker wall (in a hallway closet) so it’s no big whoop.

Seems I’m all over the map as far as HiFi gear goes, but as far as women (woman) I settled/cemented on Black Irish in the early 90’s and have never regretted it (good Black Irish don’t crack - as the saying goes).

DeKay

I like the way tubes and transformers look! Lots of great looking gear mentioned Air Tight, Shindo, Leben, Atma-sphere, Electronluv, Luxman. I would add Wavac, Kondo, and vintage Marantz. I find stuff like Dared and Raven a touch too blingy for my tastes.

In my system the integrated sits front and center on the floor, where its hard to imagine anything looking better than this. 
https://www.ravenaudio.com/product/reflection-mk2/

My sensible side says Osprey but the emotional side keeps whispering, "Reflection."

Viva Audio Beautiful Italian design.

Now, Luxman.

The Conrad Johnson Premiere 8 and 12 come to mind.

The Cary SLP 05
Unison Research
Real shame I've ever only found a way to have a CJ P10 pre in my system.

Best,
E

Really most of these look like all the rest....they look like they were taken out of a 60s Console Stereo .The guts.The Manley do but the model with the metal side handles look cool.The tube amps from Vincent look great the way he just took the Dyancos and made them look like pieces of Art.I have a Fisher 300 that's nice ,Harmon  Kardon  1000 the copper base is super nice ,Same with the Sherwood .But those Monster tube mono blocks with giant tubes look freaky...but for me it's to dangerous to just leave them out in the open on the floor.But I would take a Vincent or Dared 130 for a classy desk unit that sounds Great and looks Great.

Ancient Audio 

@twoleftears   beat me to it.  Airtight is gorgeous. +1

Airtight: there's something about the understated approach and that particular shade of gun-metal grey.

Aric Audio amps with the wooden enclosures

You can't have this conversation without mentioning Don Sachs. He builds some very attractive gear.

Oz

McIntosh and Quicksilver 

Yes that Dared 130 looks good with cover on it ,that's how I keep it on my  stereo set up ,I have it hooked up with Sonus Farber Lutios there book shelf with black leather tops.When people come over they are really impressed .I have a Emotiva  3 cd player and Fluance rt85 tt hooked up.It puts out like 30 wpc.Plenty for the speakers. 

I do like the Frankenstein lab look of a lot of tube gear out there but for me Audio Research still puts out some of the classiest looking tube gear.

Electronluv

and nothing else is even close.....it’s high art. it makes all the rest look.......boring.

Josh Stippich is a genius.

http://www.electronluv.com/

Real men prefer Manley of course. 

Hi,
Hovland, Luxman, Pathos, Emille have nice designs.

Trafomatic NOA monoblocks 

Atma-sphere.
It looks like it came from Dr. Frankenstein's laboratory.
http://www.ultrahighendreview.com/atma-sphere-s-30-mk-3-3-otl-power-amplifier/

Two distinctively different aesthetics that I happen to like both visually (and I don't own either) are Jadis ORCHESTRA Black and, probably more controversial, the Line magnetic LM-518IA in white with gold front panel.

Wow! That Dared does look very pretty! And look at Dared VP-99P! Dared MP-5BT not on the same level, but still nice/differently looking

But I have a Dared130 take a look see.

True alot of them look pretty much the same.

Leben

Luxman