Each guide and mod walks through the actual mechanics of the job — what to do, in what order, with what tool, and how to tell it worked — not just the theory behind it.
Guides
Initial Startup Guide
Safe first power-up steps for a freshly built or repaired amp.
GuideHow to Bias an Amp
A step-by-step walkthrough of the biasing process, start to finish.
GuideAmp Recapping Guide
Replacing filter capacitors the right way.
GuidePower Cap Bleeder Guide
Why a bleeder matters, how to size one, and how to install it safely.
GuideGrounding Schemes
Star ground vs. bus ground, chassis vs. signal ground, and the ground-loop mistakes that cause most tube amp hum.
GuideMods
Nobrato Channel
Cap-Tap Reverb Mod. Add spring reverb to the Normal channel of Fender AB763-style tube amps with one 330 pF capacitor. Tremolo stays with the Vibrato channel, just as the name indicates - at least by Leo's rules! Least-invasive, fully reversible bench guide.
ModNFB Voicing
Turn the unused ground switch into an NFB Voicing selector: Silver (stock NFB), Blonde (half NFB), Tweed (no NFB). Only one added resistor.
ModTriode / Pentode: Power Reduction Mod
Turn the unused ground switch into a Triode / Pentode power reduction selector. Only one switch replacement.
ModComing soon: more hands-on guides for restoration, mods, and diagnostics.