Your journey with lower-watt tube amps -- Can a kit be good enough?

If you like the idea of a kit (or they will build a complete amplifier), I agree with the Dynaco design option. The company Tubes4hifi has kits and fully assembled amplifiers based on some of the most popular Dynaco products: ST-35, ST-70 and ST-120.

The ST-70 uses EL34, 6L6, or KT-66 tubes power tubes, and puts out 30ish WPC depending on tubes. Uses 12AU7 driver tubes, and a 5U4G rectifier. Completed amplifiers are about $1,650 with all tubes.

I own their VTA ST-120 amplifier, that I've had for 5 years or so, and I can tube roll power tubes (6550, KT-88, KT-120, or KT-150), 12AU7 drivers and 5U4G rectifier. Power varies with power tube choices, but I think the 6550s are around 45 WPC and up to 80ish WPC with KT-150s. Completed amps with all tubes are $2,050 with 6550 or KT-88, and more with KT-120s and KT-150s

I also have Aric Audio and CODA amps, but will not get rid of the KT-120....not sure if it is what you are looking for, but they are really good amps

Thanks for the Dynaco ST-70 et al. suggestions. Since I am already running a Quicksilver Mono 60 with KT-77 tubes, I'm not sure this amp is really going to sound all that different. If I stick with the vacation analogy, I want to emphasize that I want to go somewhere really different and not have a "staycation."

I've had really good experience & sound with Mellow Tone Kits. Easy builds & their build instructions are posted on YouTube videos. They also give you all the specs & measurements for their equipment. Now I've only built 2 of their preamps..one in full kit form & the other just using the PCB boards they sell separately for a good price..though they did go up in price this year. Their boards are very versatile so you don't have to stick to the schematic they share. 

I've listened to their GU50 8watt monoblocks recently & was very impressed.. especially for 8watts. I thought it sounded great.  It's like $2k for the full kit though. I will add that I really like these guys at Mellow Tone/ValvesnMore. Super cool. 

I've built the original ST-70 & find it ok.. good amp for the money. When you part them out all new & spend under $1k it's just a good deal for a tube amp. A buddy has the Tubes4Hifi 12au7 ST-70 & it seems solid & an upgrade to the original..just a little different. I built their most recent SP13 preamp which is good, I prefer the MTK's but they have limited inputs & no remote in comparison. I wanted to try the SP14 & their ST70 but my experience with them wasn't stellar so I've kinda put them on the back burner. Skunkie designs just did a build video for the Tubes4hifi amp that kinda got me interested again. I have some chassis & transformers from the ST70 laying around. 

I really like the Van Alstine Ultimate PCB ST70. I use a sub so I  cut/roll off the bass on the Alstine amp around 50hz or so. I've built a couple of them at this point. Finishing another one up right now with transformers from Heyboer & Pacific Transformer. The OPT's from Pacific are cheap on price so I'm very curious how they will sound when complete. The owner insists that I'll be happy..we will see. First time I've used non-Dynaco iron. 

Pete Millet has some amp designs I'd like to try. He has some 50watt monoblocks that I just seen posted recently..though I'm not sure if he sells the PCB's for them on his eBay page. He has some amp projects on Wauwatosa Tube Factory WTFamps.com..i believe he still sells PCB's for some of those projects. 

Edcor Amps/Kits has links to DIY designs. 

Transcendent Sound sells full kits

Analog Ethos has very nice looking low powered kits. 

Specimen Products. Chicago based has an expensive SET & a couple other amp kits 

No personal dealings with those I listed..I just have them saved in my phone from when I was probably searching for kits/designs. 

PCB's & schematic designs are not kits though obviously. Like others have mentioned there are not a lot of full kits out there for sale. I'm hoping that if anyone  knows of any that exists to please mention them in this thread. Skunkie Designs has done a few low powered amp builds on her channel & posts all the parts needed. I wish I had the tools & skills to build the amp chassis/enclosure. If anyone knows of a place or person that will fabricate/cut out top plates for a fair price please mention it. 

At the moment I'm using a solid state class D Hypex Nilai DIY amp. High power extremely easy build. No soldering involved. I've paired it with a non-kit Icon Audio LA4 mkiii tube preamp that I did the Signature upgrade on. In my scenario I find the Nilai kit to perform & sound fantastic for the price. 

I forgot to add. To answer your original question I don't have any experience with low powered kits. But I'm interested in them. The one 8watt unit I heard was definitely good enough on speakers over 92db..4 & 8 ohm

@mattw73 Thanks for your detailed response. Very generous of you! The GU50 looks interesting and I like those guys too