Hey Jafant, good to "be back"! ;-)
Aside from the Thiel speakers which I hope will one day be restored to their full glory, I have an old Kenwood amp from my father, which must be about as old as the Thiels. At some point I'd like to get more into DIY electronics and try my luck at making my own amplifier using some valve tubes, but I think I've still got a long way to go until then! During the lockdown I've actually gotten into building my own (mobile) 12v sound system - geared more towards bass-heavy music i.e. dub, roots, jungle - which has been quite a nice experience and learning curve. I began with a 12v AGM battery and 1200w Pioneer amp, and then built a "Cubo 15" and some custom enclosures for 2x 8" mids and 2x 1" tweeters in a mono stack. I've since crafted some separate (and nicer looking) horns for the tweeters and some "mini-scoops" for the mids - now stereo - for home and studio use, until I can take the system for a ride in warmer weather.