i'm not sure what the polarity is, but if you have a center +, just
try it. i know from experience it won't kill it.

--- In tr-707@yahoogroups.com , "creekree2000" <creekree@...> wrote:
>
> hi,
>
> i recently got a 707 without a psu.
> on the back it says that 12v DC are required, so i used a 12 DC
> wallwart rated at 800mA.
> the 707 won ´t power on.
> my question is: how is the polarity of the wallwart the one i am
> using has center negative....
> the manual is of no help, so please do not direct me to that.
>
> any help is appreciated,
>
> creekree
>
> oh, btw: this is my first post in this group, so hello y ´all!
>