Little Maestro T105.

[OldTickTock]

You can make quick N dirty sig injector with an MP3 player. Connect your head phones rip the hearing end off, insert 0.1uF caps on each lead one in series for ground/earth, the other one in series for live, use croc clips if you want to keep hands out. Use music, anything, won't matter you can work your way through the circuit tracing until you hear it from the set should be able to trace the faulty stage

Chris