Specs for yamaha keyboard power adapters pa-1 and pa-4?

paul h

New member
I just inherited a Yamaha prs-70 keyboard. an online manual said the proper adapter was the PA-4, however it came with a PA-1. The PA-1 says 12 volts output. 6 Dcell bats work out to 9 volts. Is the PA-4 9 volts or 12 volts?
Thanks
 
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