Amp Restorations

Some poor amp has seen three decades of bedroom techs hacking up the circuit with random resistors they found in a drawer. Restoring a classic isn’t about modernizing it—it’s about peeling back the ugly modifications and getting back to the pure blueprint.

Unravelling the Past

When an amp comes across the bench with strange terminal strips screwed into the chassis, mystery coupling caps, and butchered ground buses, restoration becomes an archaeological dig.

• Case Studies & Bench Logs: Deep dives into historical circuit revisions, vintage Fender/Marshall/Vox troubleshooting, and bringing rare iron back to spec.
• Corrective Surgery: How to safely reverse amateur mods, clean up oxidation, re-tension tube sockets, and maintain collector value while ensuring modern operational reliability.
• Component Selection: Matching carbon composition versus metal film resistors, selecting correct coupling caps, and preserving original transformers.

Full Bench Logs

From Junk to Gem: Fender Deluxe Reverb 1971 Restoration

A 1971 silverface-era Deluxe Reverb that came in buzzing, crackling, with dirty pots and jacks and a torn grille frame — and once the chassis came out, a pair of 6L6s sitting in a circuit built for 6V6s, fed by filter caps that had been hacked to accommodate them. The full bench log covers intake through final bias: correcting back to matched 6V6s, rebuilding the doghouse to spec with fresh electrolytics, a full recap of the eyelet board, correcting resistors that had drifted, reverting circuit from A1270 to AB763, restoring the original grille cloth onto a newly built frame rather than replacing it, and a reversible three-position NFB selector tonal mod added along the way.

Full bench log

Returned from the Dead: Fender Pro Reverb 1979-80 Repair & Restoration

A CBS-era Pro Reverb that arrived completely dead. The full write-up covers a genuinely unusual diagnostic path: an unsoldered heater wire from the factory that arced and killed a preamp tube, followed by the previous owner's own troubleshooting attempt that broke a power tube pin and cracked the screen grid resistor mounted at that socket — taking the amp the rest of the way to fully dead. From there: a full board audit, a complete recap with TAD electrolytics and orange-drop coupling caps where leaking, correcting the factory's balance-only bias pot into a genuinely adjustable one, and two fully reversible mods — a switchable tweed-voiced tone stack and reverb/tremolo extended to the Normal channel.

Full bench log

Factory Fresh, 57 Years Later: Fender Vibrolux Reverb 1969 Full Inspection & Recap

A genuinely rare case: a 1969 silverface-era export-model Vibrolux Reverb that had never been opened since it left the Fullerton factory — no prior service, no prior repairs, nothing. The full write-up covers a full component-by-component inspection and the judgment call that comes with an amp this original: every electrolytic capacitor, doghouse and eyelet board alike, replaced with fresh F&T caps, while the original film coupling caps, resistors, and wiring stayed in place because they still tested good.

Full bench log

Coming Up

More real-world restoration logs, straight from the bench, coming as they're finished.