Won’t power on
A dead amplifier or repeatedly blowing fuse can indicate a fault in the mains or power-supply circuitry.
Guitar & bass amplifier repair UK
Guitar & bass amplifier repair across the UK.
From vintage valve amplifiers to modern solid-state and hybrid designs, every repair begins with systematic fault-finding and a clear assessment.
Discuss an amplifier repairAmplifiers we repair
Valve, solid-state and hybrid.
Repairs are welcomed from owners of Marshall, Fender, Vox, Orange, Blackstar, Laney, Peavey, Ashdown, Ampeg, Mesa/Boogie, Hiwatt, Roland, Yamaha and many other makes.
If your model is not listed, get in touch with the make, model and symptoms.
Common amplifier problems
What is your amplifier doing?
Humming or buzzing
Excessive noise may be caused by ageing components, valves, grounding or power-supply faults.
Crackling or cutting out
Intermittent faults are reproduced and traced before parts are replaced.
Weak or distorted output
Signal-path testing locates loss of volume, unwanted distortion and changes in sound quality.
Overheating
Burning smells, excessive temperature and repeated fuse failure should be investigated before further use.
Controls and connections
Scratchy controls, unreliable sockets, switches and effects loops are checked mechanically and electrically.
Our amplifier repair process
From reported fault to a properly tested repair.
Every amplifier is approached methodically. You are kept informed of the diagnosis, likely cost and repair options before additional work is carried out.
1
Assessment
The reported symptoms are discussed, the amplifier is inspected and the fault is checked where safe to do so.
2
Diagnosis
The cause is traced using appropriate test equipment and circuit-level fault-finding to establish which work is needed.
3
Approval
The findings, repair options and likely cost are explained. Work beyond the initial diagnostic is agreed before proceeding.
4
Repair
Approved work is completed using suitable, correctly rated components and careful workshop practice.
5
Testing & play test
The amplifier is electrically checked, tested under suitable conditions and play-tested to confirm the original fault is resolved.
6
Return
You receive a clear account of the work completed, along with any relevant advice for safe and reliable use.
Amplifier repair across the UK
Local workshop care with UK-wide enquiries welcome.
Guitar Doctor UK is based in Lowestoft, Suffolk. Local workshop visits are by appointment, and courier repairs can be discussed for customers elsewhere in the UK.
Before sending an amplifier, get in touch with the make, model, symptoms and your location. Packing and delivery arrangements can then be agreed before the amplifier is shipped.
How to arrange a courier repair →Amplifier pricing
Clear starting costs.
Diagnostic fee£50Up to 45 minutes; deducted if the repair proceeds
Valve amp serviceFrom £175Plus parts
Repair labour£75/hrPlus parts
Service and repair
See the work behind the diagnosis.
Vox AC30C2: tracing power-supply buzz
A failed reservoir capacitor was identified through power-supply measurements. The repair was followed by controlled power-up, valve checks and a play test.
Read the AC30 case study →Outside Suffolk?
Discuss your amplifier and delivery arrangements before booking a courier.
Plan a UK repair →Valve amp servicing
Condition checks, cleaning and service work from £175 plus parts.
Explore servicing →Start with a conversation
Tell me what needs attention.
Send the make, model and symptoms, or book a workshop appointment. Discuss courier arrangements before sending an amplifier.
Workshop visits by appointment · Lowestoft, Suffolk