Sortaflex: D.I.Y. Tube Bass Preamp | T. Hallenbeck
Guitar Pedal X - GPX Blog - Drunk Beaver's Trainer TS-15 Preamp Perfectly Captures that Small Amp Dynamics and Punchy Character
My DIY Soldano SLO tube preamp (with plans and demo) | Ibanez JEM Forum
Solid State Amp/Preamp Pedal — Acorn Amplifiers | Tube Amplifiers, Boutique Amps, & Effects Pedals
DIY Custom Tube Preamp - YouTube
DIY Guitar Tube Preamp Build and Demo (Super EASY!) - YouTube
Soldano Preamp | DIY Fever
diy tube preamp for guitar? | diyAudio
The MacGuffin - A Dumble ODS preamp with submini tubes | PedalPCB Community Forum
Are pedals with tubes the same as tube preamps? - The Tone King
A DIY valve overdrive pedal – Goldie – Dave Mac's Window on the World
High voltage tube guitar preamplifier with 12AX7 - H&G Amplifiers
DIY tube guitar overdrive PCB - fully assembled | Reverb
Laval Audio - All-tube guitar/bass mini-preamp stompbox - YouTube
Tube Distortion Pedal | Electronic Schematic Diagram
DIY Tube/ Valve Guitar Preamp (Hand Made) - YouTube
Blackbird Vacuum Tube Preamp for guitar - Effectrode
A DIY valve overdrive pedal – Goldie – Dave Mac's Window on the World
12AX7 Tube (valve) Preamplifier Kit
12au7 guitar preamp – FrogPedals.com
Blackbird Vacuum Tube Preamp for guitar - Effectrode
