Warming up the tubes...
Grampy's Amps
Vintage Amp Restoration  ·  David Vomacka

Breathing life back into the finest tube amplifiers ever made.
From tweed Fenders to screaming Marshalls — restored to sing again.

GRAMPY

David Vomacka

David has spent decades chasing tone — disassembling, diagnosing, and resurrecting the vintage tube amplifiers that defined rock and roll. What started as a passion for the gear his grampy played has become a life's work restoring classics for players and collectors across the country.

Every amp that comes through the shop is treated with the reverence it deserves. Original components are preserved wherever possible. Transformers are rebuilt. Cabinets refinished. And when it's done, it sounds better than the day it left the factory.

50+
Years Experience
100+
Amps Restored
100%
Passion Driven

The Work

Volume
Treble
Bass
Reverb
See All Work on Instagram

Services

Whether it's a sick amp that needs diagnosing or a museum piece that deserves full restoration — David treats every amp with the same obsessive care.

Full Restoration

Complete recapping, transformer inspection, tube replacement, bias adjustment, and cosmetic restoration. Your amp, reborn from the ground up.

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Repair & Diagnosis

From mysterious hum to dead silence, David will find what's wrong. Schematic tracing, component testing, and honest estimates before any work begins.

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Mods & Upgrades

Cathode follower tone stacks. Presence controls. Master volumes. Footswitch channels. If you've dreamed it, David can wire it — without destroying originality.

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Process & FAQ

Clear process, realistic timelines, and no surprise work. Final pricing is confirmed after bench diagnosis.

1) Initial Contact

Send model, year, symptoms, and photos. You'll get a rough range and next steps for drop-off or shipping.

2) Bench Diagnosis

A full technical assessment confirms parts, labor, and turnaround before restoration begins.

3) Approval & Restore

Work is performed only after approval. Originality is preserved whenever possible, with any mods discussed first.

4) Test & Return

Final burn-in and play test before pickup or return shipping.

Frequently Asked

Turnaround: typically 2-6 weeks depending on parts and queue.

Shipping: accepted nationwide with proper packing and insurance.

Quotes: AI estimate is directional; final quote comes after diagnosis.

Follow the Journey

David documents every restoration on Instagram — before and after shots, wiring diagrams, glowing tubes at midnight, and the occasional masterpiece complete.

@grampys_amps on Instagram

Describe Your Amp

Tell David what you've got and what it needs. The more detail the better — make, model, year, symptoms, what you're hoping for.

Service area: Cincinatti area. Prefer direct contact? Send a direct message on Instagram.