Learn Valve Amp Building
Author: Kevin M Date Posted:24 October 2026
Evatco Knowledge Centre
Learn to Build Valve Amps
Want to build your first 5F1, understand why a Bassman sounds the way it does, or finally make sense of a schematic? These are the books, websites and YouTube channels we actually use and recommend, from complete beginner through to serious amp design.
We are not paid to recommend any of them. They are simply the people and resources we respect most.
Safety first: Valve amps run lethal voltages, and filter capacitors can hold a charge long after the amp is unplugged. Learn how to drain caps and work safely before you open a chassis. Read our Safety First page before you start.
People We Respect
If you only follow four sources, make it these. Between them they cover the theory, the maths, the hands-on build and the real-world repair bench.
The Valve Wizard
Merlin Blencowe · UK
The gold standard for understanding why a valve circuit works. Merlin's site explains gain stages, phase inverters, tone stacks and power supplies in clear, engineering-grade detail without drowning you in maths. His books are on nearly every serious builder's bench.
Rob Robinette
robrobinette.com · USA
Probably the best free starting point on the internet. Rob walks through classic Fender and Marshall circuits stage by stage, with annotated schematics, voltage charts, bias calculators and practical build notes. Perfect when you are building your first tweed or blackface.
Brad's Guitar Garage
Brad Webb · Australia
An Aussie channel we love. Brad shows real amps on a real bench: diagnosing faults, retubing, recapping and building, explained in a down-to-earth way that makes the process far less intimidating for newcomers.
The Amp Tech Guy
Chris Tarakson • Repair & troubleshooting
Practical, no-nonsense amp repair. Watching an experienced tech work through faults is one of the fastest ways to learn how amps fail, how to measure what is going on, and how to fix it properly.
More YouTube Channels Worth Your Time
Great for learning by watching. Put one on while you sort your parts.
Uncle Doug
Gentle, beautifully explained lessons on how every part of a valve amp works, from rectifiers to output transformers. Ideal theory primer for beginners.
Psionic Audio
Calm, methodical bench repairs on vintage and modern amps. Excellent for learning fault-finding technique and good workmanship.
Mr Carlson's Lab
Deep-dive valve electronics, restoration and test equipment. More radio than guitar, but a masterclass in how valve circuits really behave.
D-Lab Electronics
Amp repairs, mods and DIY projects with clear explanations. A nice middle ground between theory and hands-on work.
Websites, Forums & Free Tools
Reference material, calculators and communities where experienced builders answer questions.
Aiken Amplification
Randall Aiken's technical articles on phase inverters, negative feedback, biasing and more. Classic, authoritative reading.
Duncan's Amp Pages
Home of the free Tone Stack Calculator and PSU Designer software. Model tone controls and power supplies before you build.
AX84
A long-running community built around simple, well-documented beginner amp projects, with free schematics and build guides.
GEOFEX
R.G. Keen's articles on amp and effects electronics, including excellent material on power supplies, layout and grounding.
Frank's Electron Tube Data Sheets
A huge free archive of original manufacturer valve data sheets. Essential when choosing operating points.
AGGH – In the Shed
Australia's own guitar and gear forum. Head to the In the Shed section, where Australian amp builders share builds, help each other troubleshoot and know exactly what is available locally, from 240V mains wiring to where to find parts.
EL34 World
Doug Hoffman's huge library of tube amp information: schematics, layouts, turret and eyelet board guides, project builds and mods, plus a friendly forum for builders' questions.
Music Electronics Forum
One of the best forums for amp techs and builders. Search first, then ask; the depth of experience here is remarkable.
The Best Books on Valve Amps
Nothing beats a good book on the bench. We have grouped these from beginner to advanced so you can pick the right starting point.
Books are special order only. They take approximately 3 weeks to arrive once your order is placed.
We are adding these titles to the Evatco store now. In the meantime, to order any book below, please contact us here with the title and we will get it on its way.
Start Here: Beginner Friendly
How to Service Your Own Tube Amp
Tom Mitchell
A well-organised guide to basic electronics, reading schematics, biasing and test gear, with troubleshooting flowcharts and voltage charts.
Guitar Amplifier Electronics: Basic Theory
Richard Kuehnel
Valve amp theory taught with visual, web-based design tools rather than pages of formulas. A great way into how circuits behave.
Building Vacuum Tube Guitar & Bass Amplifiers, Vol. 1
Tino Zottola
Detailed construction of five valve amplifiers from scratch. A hands-on first project book.
All About Vacuum Tube Guitar Amplifiers
Gerald Weber
Over 500 pages of practical, test-bench knowledge that demystifies how tube amps really work.
Sound Advice from Gerald Weber
Gerald Weber
Weber answers more than 300 common questions about valve guitar amps. Easy to dip in and out of.
Electric Guitar Amplifier Handbook (4th Ed.)
Jack Darr
A reprint of the 1973 classic covering amplification theory, how each part works, and many period schematics.
Going Deeper: Design & Building
Guitar Amplifier Design: Tubes and Semiconductors Play Together
Ulrich Neumann
Look over the designer's shoulder as a unique amp takes shape, with insights on tone and best-practice circuit design.
Guitar Amplifier Overdrive: A Visual Tour
Ulrich Neumann
How valve amps actually produce overdrive, explained and illustrated circuit behaviour by circuit behaviour.
Fundamentals of Guitar Amplifier: System Design
Richard Kuehnel
A structured, top-down approach to designing a complete guitar amplifier.
Guitar Amplifier Electronics: Circuit Simulation
Richard Kuehnel
A step-by-step tutorial on simulating valve guitar amps in the free LTspice software. Test ideas before you heat the iron.
Guitar Amplifier Electronics Recipes
Richard Kuehnel
For experienced designers: concise procedures and formulas for designing specific circuits, without the long explanations.
Building Vacuum Tube Guitar & Bass Amplifiers, Vol. 2
Tino Zottola
Plans for five classics: Deluxe 5E3, Bassman 5F6A, AC30 Top Boost, Plexi Super Lead and Twin Reverb AB763.
Building Vacuum Tube Guitar & Bass Amplifiers, Vol. 3
Tino Zottola
Advanced builds replicating the AC15, Marshall 1958, Princeton Reverb, Gibson EH150 and Hiwatt DR103.
Classic Amp Deep Dives
Guitar Amplifier Electronics: Fender Deluxe
Richard Kuehnel
An in-depth look at the 5E3 and AB763 circuits, plus the 5D3 and brownface 6G3.
Guitar Amplifier Electronics: Fender Bassman
Richard Kuehnel
Explores the circuits of the Bassman, the amp behind so many great rock and blues tones.
Guitar Amplifier Electronics: Soldano SLO
Richard Kuehnel
A detailed study of Mike Soldano's iconic 1987 SLO-100 and what makes it tick.
Vintage Reference
RCA Receiving Tube Manual RC-30
RCA (reprint)
A quality reprint of the 1973 manual, including EL34, GZ34, 6550, 7591 and many more. A bench essential.
Mullard Tube Circuits for Audio Amplifiers
Mullard (reprint)
The 1959 Mullard collection of high-quality amplifier and preamp circuits, with construction notes.
Related Reading
Electronic Projects for Musicians
Craig Anderton
Build a preamp, compressor, phaser, talk box and more than 20 other musician's accessories.
Guitar Player Repair Guide (3rd Ed.)
Dan Erlewine
The go-to manual for maintaining, setting up and repairing electric and acoustic guitars and basses.
Also Essential: The Valve Wizard's Books
Merlin Blencowe's books are available direct from the author. If you are serious about design, start with Designing Valve Preamps for Guitar and Bass, then Designing Power Supplies for Valve Amplifiers. Find them on valvewizard.co.uk.
Evatco Guides & Tools
Ready to put it into practice? Our own guides, parts lists and simulators will help you plan your build.
Should I Build a 5F1 or 5E3?
Choosing your first tweed build, plus full parts lists for the 5F1, 5E3 and 5F6A.
V1 Preamp Tube Simulator
Hear and compare how different preamp valves change your first gain stage.
Guitar Amp Transformer Finder
Find the right power and output transformer for your build or repair.
Knowledge Centre
All our FAQs, cross references, calculators and how-to guides in one place.
Ready to Start Your Build?
From valves and transformers to turret boards, cloth wire and chassis, Evatco stocks the parts you need, shipped fast from Brisbane. Not sure where to begin? Get in touch and we will point you in the right direction.
