Looking for a new project...

If you like the Elekit products, TU-8500 or TU-8550 are both good options. TU-8550 is a matching preamp for the TU-8600. Same faceplate and control configuration as well as same footprint so they stack easily.

I just finished my TU-8550 yesterday and it's a fantastic addition to my Elekit collection with a TU-8200 amp and TU-8500 preamp. I will be building the TU-8600 or TU-8900 next.

VKung sells them and will offer upgrade options as well.

Good luck!