Not sure how I came across this but was checking in at sweetwater to see when the TC100 would be available. Then I found the Synergy modular system. Interesting. The dual slot preamp chassis can take any of the modules they provide. You can use the chassis with any amp to add more channels or drive a power amp in mono or stereo. They also have heads and a combo. I think I would be more into the rack mount system and couple it with a Fryette power amp or a Mesa power amp. The Fryette 2:90 using KT88 may be or the Synergy 2:50 can be used as a 50W stereo or bridge it for 100W mono. Cool thing about the Synergy system, it is midi controlled, each module has 2 channels so that would give you 4 channels. Check it out. Solando module, JCM800, Friedman, Morgan, and others. Not a new concept but at least it is more modern than what was done before. Power amp section was designed by Fryette amplification so would be cool in some respects.
https://www.sweetwater.com/store/detail/SYN-2
https://www.sweetwater.com/store/detail/SYN-2