Surrey Audio Works is an independent, appointment-only workshop based in Chertsey, Surrey, offering professional valve guitar amplifier servicing, repair and restoration.

From modern gigging amplifiers to cherished vintage classics, each amp is worked on carefully, safely, and with long-term reliability in mind.

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Valve Amplifiers, Treated Properly

Valve guitar amplifiers are high-voltage electrical devices, often operating under significant thermal and electrical stress. Whether an amplifier is brand new or over fifty years old, proper repair requires:

• accurate fault diagnosis

• careful measurement and testing

• respect for original circuit design

• a clear understanding of electrical safety

Surrey Audio Works specialises  in valve guitar amplifiers, applying a methodical, safety-focused approach to every job.

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Vintage & Classic Amplifiers

Vintage and classic valve amplifiers present unique challenges: ageing components, obsolete parts, undocumented modifications, and the accumulated effects of time.

This is where careful, informed work matters most.

Our service and restoration work aims to:

• preserve original tone and character

• improve reliability and safety

• respect originality wherever possible

• avoid unnecessary modification

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​Modern Valve Amplifiers

Alongside vintage work, we regularly service and repair modern valve guitar amplifiers, including reissues and current-production models such as Fender Hot Rods, Blues Juniors, modern Marshall designs and a myriad of exotic boutique creations.

Many modern valve amps share core design principles with vintage circuits, while introducing denser PCB layouts and cost-driven component choices. The same careful diagnostic approach is applied, whether an amplifier is decades old or fresh from the factory.

 

Valve Amplifier Servicing

Routine servicing helps prevent failure, reduce noise, and keep amplifiers performing as intended.

Typical servicing includes:

• electrical inspection and testing

• assessment and replacement of ageing  components

• valve testing, replacement and biasing

• noise, hum and stability checks

• PAT test with certificate if required

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​Valve Amplifier Repair

Professional diagnosis and repair of faults including:

• power supply and output stage issues

• preamp and tone circuit faults

• intermittent noise, crackle and instability

• control, socket and connection problems

• Channel switching issues, fx loops, tremolo circuits etc. etc. 

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A Careful, Safety-Focused Approach

Valve amplifiers operate at dangerous voltages.

Every amplifier we work on is treated as a piece of high-voltage electrical equipment, not just an audio device.

Our approach prioritises:

• Electrical safety

• Long-term reliability

• Clear communication about what work is needed — and why.​

 

How It Works

1. Get in touch  here with a brief description of your amplifier and the issue.

2. We’ll discuss likely work required, and current turnaround times, and add you to the list.

3. When your job is nearing the top of the list, we'll get in contact to arrange a drop-off appointment.

4. Your job will be started as soon as practicable, so that following your agreement, any parts not in stock can be ordered.

5. Your job will be completed as soon as any necessary parts arrive.

6. Your amp will be thoroughly soak-tested before pickup is arranged.

 

Based in Surrey — Working With Musicians Across the South East

Surrey Audio Works is based in Chertsey, Surrey, serving guitarists, studios and collectors across Surrey, London and the South East. Conveniently situated just a mile from Junction 11 of the M25

​If you’d like to discuss servicing, repair or restoration of a vintage guitar valve amplifier, please get in touch:

The best method for me is via the Contact form. 

 

Appointments by prior arrangement