I've actually replaced these before...they should be avail. at your
nearest elec. store. be careful though because there are diff size
center pins for the same size plug. If I recall correctly both sizes
will work, but only the SMALLER SIZE will work with the original
roland ac adapter...the larger pin size is too large for the original
roland plug. Can you solder
Email me at dwn4tupac@... and I'll see if I can't find you the
part. What is shipping for 3gms to europe from wisconsin ! ! ! LOL

I was actually offering this repair as a service on ebay a while back
but didn't have any takers so I pulled the auctions.

--- In tr-707@yahoogroups.com , "indisguiserobot" <cliff_chapman@...>
wrote:

>
> Hi, hope someone can help me with this.
>
> The negative centre pin on the powerjack of my 707 has somehow broken
> off and disappeared!!!
>
> Does anyone know where I can find a replacement powerjack
>
> I found a mod to convert the machine to run off of batteries and it's
> working perfectly like that, but obviously I still want to run it from
> the mains as well, I've got the original wallwart transformer.
>
> I'm in the the UK.
>
> Thanks Cliff
>