El JamMan, por algún motivo, lo han fabricado en dos versiones que solo difieren en la alimentación. El mismo manual de instrucciones lo indica:
*IMPORTANT NOTE: There are two different models of this product. If
purchasing a replacement power supply, ensure that you properly match the power
requirements screening on the back panel of the product with the corresponding
adapter model listed below.
Power Requirements: 9 VAC 1.3 A*
Japan (100 VAC, 50/60 Hz): PS0913B-100*
US and Canada (120 VAC, 60 Hz): PS0913B-120*
Europe (230 VAC, 50 Hz): PS0913B-230*
UK (240 VAC, 50 Hz): PS0913B-240*
Australia (240 VAC, 50 Hz): PS0913B-240-AU*
Power Requirements: 9 VDC 1.3 A*
US, Canada, Europe, Japan (100-240 VDC, 50/60 Hz): PS0913DC-01*
Australia & UK (100-240 VDC, 50/60 Hz): PS0913DC-02*
http://adn.harmanpro.com/product_documents/documents/245_1305738169/JamMan%20Stereo%20Manual%2018-0707V-B_original.pdf
Estoy seguro de que esto ha traido multitud de problemas.