Bass Amps repairs for most makes from Ampeg , Fender, Marshall, Mesa Boogie to more obscure brands. We perform repairs, customer modifications and service to valve amps and transistor amps alike. We always repair with genuine manufacturers parts and can also offer alternative replacement parts where necessary. We have access to the schematic drawings and diagrams from most major manufacturers.
Typical faults: As with electric lead guitar amps faults listed below can be anything from blown components to broken connectors, although with bass amps there are often more rattles that need sorting. ( normally due to hotmelt glue / silicon becoming unstuck ) . We can diagnose faults when we open up the amplifier and check with a meter / scope. We charge a £35 bench charge to open up the amp and diagnose the fault. This covers one hour of labour in fault finding which is deductable against the repair if taken.
No Output : could be anything from power / output / preamp / speaker / switches / standby problems.
Revalve : worn valves, rebiased and checked.
Distorted output : Low power rails, blown op amps, incorrect biasing , faulty speaker.
Lack of Volume : Valves , output stage damaged. Input op amps blown.
Intermittant output : Bad connectors , valve sockets , speaker problems
Noisey controls : New pots needed , clean existing pots
Crackles : Pots, Jack Sockets, Valves, Cables
Blows valve resistors : Sometimes wrong transformer wiring ( 230v / 240v )
Front Face light intermittant: bulbs, cables or rheostat
Blowing fuses : Dodgy Valves , S/C components , Faulty Transformers
No lights / power at all : Blown fuses, transformer, bridge rectifiers /standby problems
Buzzing sounds , rattles : capacitors , diodes , rectifiers , reverb units