I know there are DIY tube amp kits, but what would be really great is if there was a solid state preamp kit, along the lines of a transtube circuit, that worked with a variety of off the shelf amplifiers.
Most tube amp kits involve a handful of relatively expensive parts. OTH, a solid state preamp circuit could probably be built using parts that cost a few dollars, and you wouldn't have to build the amplifier as there are a plethora of pre made amplifiers.
Instead of "swapping tubes" the new thing would be "swapping amps". All of those mini pedal power amps are using some OTS class-D power amp that you can probably get on alibaba for < $20.
Most tube amp kits involve a handful of relatively expensive parts. OTH, a solid state preamp circuit could probably be built using parts that cost a few dollars, and you wouldn't have to build the amplifier as there are a plethora of pre made amplifiers.
Instead of "swapping tubes" the new thing would be "swapping amps". All of those mini pedal power amps are using some OTS class-D power amp that you can probably get on alibaba for < $20.