Need Some Tube Amp Advice

Check out Quicksilver Audio, they are sure to have something to meet your needs on both the amp and preamp, Carved also has a pair of mono block, 75 watt amps that look to be a steel at around $2,700.00. I personally replaced a pair of VTL 125 monos that were 20 years old with a pair of the QS m120s at 1/2 the price and love them. Enjoy the music.

You might be better off with getting an integrated amp. Check out  this Rogue Audio integrated, it includes a phono section. It should fit the bill!
https://www.needledoctor.com/Rogue-Audio-Cronus-Magnum-III-Integrated-Amp

Line Magnetic makes a nice line of integrated tube amps.

Luxman makes SQ-N150 integrated (10 wpc) includes phono preamp and remote. I great sounding amp at $2,795  with plenty of power for your speakers

What's your budget? The Cornwalls are pretty tube-friendly.

You don't need a lot of power so this is all about nuance. Smaller tube amps often have more bandwidth (although because our amps are output transformerless this doesn't apply to our amps) which allows them to be more spacious.
If you decide to go with an SET (Single Ended Triode) amplifier, keep in mind that whatever power the amp is rated, you will not want to exceed about 20% of that power in order to get the most out of that amp. With push-pull amps this isn't true- they typically have a much wider 'usable power' range (SETs are typically 10% distortion at full power; to keep that down and hear what they are really about you need to stick to that 20% rule). A push-pull amp that will do the job on a speaker with this sort of efficiency need only make about 15-30 watts. A lot depends on room size and how lively it is! Because of the lower power requirements, a triode amplifier is nice (and there are triode amps that are push-pull).
If you get this right you'll be hearing things in the music you didn't know were there and overall the system will also play in a more relaxed effortless manner. One thing to keep in mind- its not so much about money as it is about nuance. There are good inexpensive amps and there are good expensive amps, along with their opposites.

Are you planning monoblocks or a stereo amp? Balanced or single-ended connections? How big is your room and how lively is it? These are things that will help people here be able to help you more.

I live in a loft space with 15 foot ceilings in downtown Miami! Basically a cement rectangle with polished cement floors! Its 900+ sf and I have an 8'X 10 foot oriental carpet running down the length of the apartment as well as a 4X6 foot in front of the system! So to say the room is lively its an understatement! But at one end of the rectangle is my bed which offers no return off the wall.  

Manley Chinook phono, Manley Jumbo Shrimp pre, Manley Mahi Mahi monoblocks.  Used prices:  Chinook $1600  Shrimp $2,000  Mahi Mahi $1900   Done

Hope this helps

I have a pair of 40w Quicksilver Mid Monos.... they are great amps!!!! Dead silent ,sound excellent with EL34 or 6l6 type , built like a tank. Mine are a little over 5 years old and have been rock solid reliable. I have had a few tube failures and either nothing happened or the fuse blew as it should with no damage. I have had several tube amps in the past and these are my favorite. I’m running a pair of Heresy III and it is a perfect match.

Jperry mentioned the Luxman,  I could not believe how great that amp sounds with Forte' III...  a must audition if looking for a low powered integrated.   Scarey how lifelike it sounded , I was with someone who is not into hifi and he was floored.

@mbd3 Given your space issues I think you'll be grateful for the reduced harshness a tube amp brings to the mix. Harshness and hard surfaces can be pretty painful!

I'm thinking that you'll want something that is about 30 watts or so since the room is rather large. With that kind of power, IMO/IME SETs are pretty much out of the question as the more powerful you make an SET, the less bandwidth you have. So a mid to lower power push-pull amp is where I would start.


What sort of budget do you have?

I use a Dennis Had Firebottle High Output single ended 12wpc or so amp and it's the best sounding amp I've used so far (with Heresy IIIs). I also own an extra one I'll be selling here soon.

I saw a review of the Luxman EL84 integrated on youtube mentioned above and the fellow said paired w/Forte III's it was the best amp combo he'd heard.  I think the Music Reference RM10 for sale here for a mere 1200 would be great and dead quiet as well.  I also agree w/Ralph a triode push pull less than 50 wpc would be the way to go something like Cary Rocket 88 or SLI-80 or Cayin or....have fun that's going to be a great sounding setup!

Dennis Had Firebottle High Output single ended 12wpc sounds like the way to go!  When are you selling and how much.  Looks like Dennis Had is selling on Ebay.

So if I get the Dennis Had Firebottle what preamp should I get???

Another contender is Bob Latino's VTA Dynaco ST-70. 35wpc uses EL34, 6L6, KT-66, 77, or 88's. Sounds fantastic and inexpensive. I've had mine for 10 yrs and am more impressed with it all the time.

Quicksilver Mid Mono's, Music Reference RM10.

I'll try to get my extra Firebottle up here on Audiogon in a few days...I use a Schiit Freya with my other one...great combo.

I just listed my Inspire "Hot Rod" amp so there ya go!

The Manleys good choice. 
A Primaluna (new or used) integrated comes with a remote, The remotes have a mute button as well. A remote controller is a beautiful thing. Primaluna Pre amps have remotes to. 
Given your room I’m not sure if you would hear a big difference with a pre and monos. BUT pre/monos are cool and the visual joy can’t be denied. 
Klipsch Cornwalls are lovely. Investing In good connects will help your new amplification set up too. 

If you are newbie to tube amplifier, I recommend you to try out Rogue Cronus integrated made in US.

Their customer service is also very excellent.

Thomas

Also consider if you want to bias or get a self biasing Amp(S). 
And please check out Rogers high fidelity. Beautiful Amps 
http://rogershighfidelity.com

Will you want to headphones? Not all rigs have a jack. 

Line Magnetic's amp are incredibly high value, considering the build and sound quality, especially if you buy used. Stereophile has one of their integrated listed as class A.

Quicksilver has an integrated amp that puts out 20wpc. That should be plenty with Cornwalls. The price is right. $1995.00.  The company has a great reputation.

Check out Stephen Monte’s SQ-88 integrated amp. Under $1800
He is a tube guy through and through with several designs in his line and developed a line of H.E speakers to go with this tube amps. The SQ-88 is tube roller friendly (el34, 6550 & kt88) with no bias fusing. Powerful 55 wpc yet all about tube sound. I have his SQ-84v2 (6v6gt  15 wpc.) integrated and it is outright beautiful to listen to on my Vandersteen 1Ci.

https://www.questforsound.com/amps/amps_sq88.htm

I can tell you without reservation ,
Jolida Audio has taken a Dramatic step
forwards in high quality, superb design and value with their New line now called Black ice Audio .Long time Designer 
Jim Fosgate has designed their excellent new preamplifier as well as 
amps .I own the Black ice  F35 and it is excellent .and one of the best looking amplifiers out there,great meter bias setup,and a fully balanced differential 
tube design for under $2k it will easily compete with anything 2 x the cost .
I owned  a Audiostore  for years and know performance,value.it is Excellent.