My next project is an Hybrid guitar amplifier: Triode preamp + Class D 25W amplifier.
FreeCAD 3D files can be found here:
The preamp section can be populated with a Korg Nutube 6P1 triode
or alternatively a 12AU7 tube
The amp is powered by an external AC/DC 24VDC out wall adapter.
It includes headphones, line out and 8
Ω speaker with 25W output.
Everyting is packed on a compact 1590J enclosure: