Precision Amplifier Services Rooted in Engineering Excellence

Professional Valve Amplifier Services

At Manchester Pro Audio Ltd, we specialise in the maintenance, repair, and restoration of classic valve amplification. Vintage and high-performance tube amps require a deep understanding of historic circuit designs, component tolerances, and high-voltage safety.

With over 30 years of industry experience, we provide expert bench technician services to keep your tone pure and your rig reliable.

What We Do

  • Tube (Valve) Amplifier Servicing: Complete diagnostic health checks, valve testing matching, and precision biasing.

  • Vintage Restoration: Sympathetic restoration of classic amplifiers (Fender, Marshall, Vox, Hiwatt, Ampeg, Orange) preserving original tone while ensuring electrical safety.

  • Tour Prep & Ruggedisation: Component upgrades, chassis cleaning, and structural reinforcement to withstand the rigours of the road.

  • Fault Diagnosis: Eliminating parasitic noises, hums, intermittent drops, and dead channels.

Our Specialist Services

  • Expert Diagnostics & Repairs: Troubleshooting faults, signal drops, unwanted noise, and power failures.

  • Precision Valve Matching & Biasing: Optimising power tube bias to maximise headroom, warmth, and valve longevity.

  • Component-Level Restoration: Sourcing period-accurate capacitors, transformers, and resistors for vintage circuits.

  • Preventative Maintenance: Deep cleaning potentiometers, retensioning valve sockets, and replacing worn hardware.

  • Safety Testing & Auditing: Comprehensive checks on high-voltage lines, grounding, and full PAT testing available.

Amplifiers We Service

We possess deep technical knowledge of classic and modern topologies, specialising in heritage brands including:

  • Marshall: From vintage Plexis and JCM800s to modern multi-channel switchers.

  • Fender: Clean blackface, silverface, and tweed circuits requiring delicate component care.

  • Vox: Managing the unique thermal demands and cathode-bias setups of AC15 and AC30 models.

  • Ampeg: Heavy-duty SVT and V-series bass rigs that require specialised high-power handling.

  • Boutique & Classic Brands: Hiwatt, Orange, Mesa/Boogie, and custom point-to-point builds.

Our Workshop Standards: We treat vintage gear with historical respect. We do not perform destructive modifications on rare pieces.

Every amplifier undergoes a rigorous soak-test under load to ensure it will not fail you mid-set or mid-session.

Services

Filters

General Service

  • Full voltage, current & RMS output evaluation

  • Deep clean of all potentiometers & switches

  • Strip & renew of any essential solder work

£99.00
Intermediate Service

  • Basic Service plus the following

  • Exchange of any necessary valves & passives

  • Bias set at O/P stage + essential tweaks to preamp Cathodes

£149.00
Advanced Service

  • Intermediate Service plus the following

  • Transformer & valve socket exchanges

  • Power supply rebuilds & Output Stage modifications

£249.00
Restoration Service

  • Advanced Service plus the following

  • Rewires & board exchanges (PCB & Turret)

  • Cabinet & Tolex restorations & repairs

£349.00

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