High voltage tube guitar preamplifier with 12AX7 - H&G Amplifiers
Soldano Preamp | DIY Fever
A DIY valve overdrive pedal – Goldie – Dave Mac's Window on the World
diy tube preamp for guitar? | diyAudio
DIY 12AU7 Tube Preamplifier Project | Valve amplifier, Vacuum tube, Hifi amplifier
Blackbird Vacuum Tube Preamp for guitar - Effectrode
Sortaflex: D.I.Y. Tube Bass Preamp | T. Hallenbeck
My DIY Soldano SLO tube preamp (with plans and demo) | Ibanez JEM Forum
DIY Guitar Tube Preamp Build and Demo (Super EASY!) - YouTube
DIY Tube/ Valve Guitar Preamp (Hand Made) - YouTube
12au7 guitar preamp – FrogPedals.com
Frog Tube Preamp 2.1 Version B PCB for DIY -Alembic F2b style – FrogPedals.com
12AX7 Tube (valve) Preamplifier Kit
Soldano Preamp | DIY Fever
Frog Tube Preamp 2.0 PCB for DIY – Alembic F2b style – Onboard Power Supply – FrogPedals.com
Sortaflex: D.I.Y. Tube Bass Preamp | T. Hallenbeck
Two Rock JM Preamp Pedal - No signal, just hum - The Amp Garage
Turn a Solid State Amplifier into a "Tube Amp" with a Tube Pedal?! - YouTube
Solid State Amp/Preamp Pedal — Acorn Amplifiers | Tube Amplifiers, Boutique Amps, & Effects Pedals
Bass Guitar Preamp Pedal DIY : Schematic & PCB Design
StompBoXed - The Guitar Pedal Builders Repository | Amplificador, Pedais de guitarra, Amplificador de áudio
4S Universal Preamplifier for 12A*7 Tubes
Alembic F-2B preamp (DIY) | Watersish.com
