Integrated Tube Amp for Focal Sopra 3

Hello everyone, this is my first post here but I have been actively reading the forum discussions for over 2 years. I would consider myself a novice in the HiFi world so your comments and help will be greatly appreciated. 

I have been contemplating adding a tube integrated amplifier to my system. Why tubes... well primarily to satisfy my curiosity. 

Currently I have a pair of Focal Sopra 3's, which I got in 2017. Before buying the speakers, I had bought European mono block amplifiers from a company called AVM. I bought the Amp used from a dealer in Scotland. The model is called M5 and I couldn't find much information/reviews about it on the internet but trusted the dealer. The Amp is probably 18-20 years old. Solid State 180W/Channel and seems to be of a very high quality given the weight and build quality of the piece (Plus the company is quite well respected apparently)

In 2018, I bought myself a used PS Audio Direct Stream Dac, which I quite like and made a significant improvement in my system. I use Tidal over Roon connected thru an Intel Nuc running Roon Rock. The Nuc is connected to the DAC over ethernet. 

The DAC is currently feeding the the Mono Blocks directly using Shunyata Research Venom balanced interconnects. 

I listen to a wide variety of music from Jazz to EDM. Budget is around USD 3000-4000. I don't mind buying used as generally one can get a better piece of equipment within the budget.

The Sopra's are rated at 91.5 db/w/1m. Any help will be highly appreciated! Thank you all and hope you are all having a great weekend.