Guitar Amplifier 5W
Guitar Amp 5W SE
Like a Fender Champ or Kalamazoo amp with EL84 output tube

This is the schematic:
No need to use dc for the ecc83 filaments as I did, I use 12ax7LP that are specially manufactured for dc filament voltage.
You can connect them same way as the el84 filament and discard d2 and c8.