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Thanks so much for that Jon and I didn't know that about the adapter symbol - thanks again! The earthing in the amp seems fine (chassis connection is solid plus there is continuity with the sleeves of the jack sockets. That said, the mains cable that he was using was a bit dodgy - felt very...

Hi all, A friend asked me to take a look at his Marshall IBS 3505 30W Micro Bass amp. Schematic is attached. He had got a nasty shock while connecting a pedal to it (Fender Metal pedal). Apparently he was holding up the pedal in both hands and turned it on and immediately jerked bolt upright and...