Tag Archives | Marshall Repair

Marshall-JCM900-repair-2 copy

Marshall JCM900 repair – Ampworks Newark

This JCM900 repair arrived after the owner found that it was lacking in volume. It’s a 2009 unit, two channel, with a 2203 type circuit on channel A and a higher gain circuit on channel B. The problem appears to have been with the amplifier bias. Although the valves were matched, the bias on this […]

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Marshall-Repair-JCM800-Repair

Marshall – 2205 Repair

This 2205 repair came to me following an unsuccessful operation by another tech. The 2205 were a new step for Marshall – and were one of a group of amplifiers that formed the ancestors of many channel switching amps we now take for granted – including amps by Mesa Boogie, Cornford, Hughes & Kettner, Marshall’s […]

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Marshall Repair JCM2000 DSL

Marshall Repair – JCM2000 DSL100

Marshall Repair This Marshall Repair was brought to me with one of those sneaky ‘hard to find’ problems. The amp was blowing fuses when the customer was playing it. He’d taken the amp to another repairer who hadn’t found any problems. Unfortunately the amp continued to blow fuses. Guitar amplifier repairs of this kind often […]

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