Guitar preamp circuit - over drive using 12AU7 | Guitar, Electronics circuit, Circuit
Engineer's amp 50W monoblock
Tube Preamp Kit: High-Gain -Tube Amp Kits from London Power
Frog Tube Preamp 2.1 Version B PCB for DIY -Alembic F2b style – FrogPedals.com
Plexi SE PCB | Guitar Amplifier PCBs
PCB for a 1W Firefly tube amp. Took about 3 hours to solder. Then another couple hours to fix the accidental solder-bridge under one of the tube sockets. These …