Found an old wall wart lying around...

[Celery_Strat]

It says "message minder", so I'm assuming it is from an old answering machine.   It is 120 vAC in and, 9vAC out.  Being a "don't throw away anything electronic" kind of fella, I decided to toss this together and splice it into the output cord.  I get 8.9 vAC at the input, 12.2 vDC out at 3.2 amps.  Just thought I'd share!  I assume the voltage increase is normal / caused by the rectification???

[geertjacobs]

http://www.geofex.com/Article_Folders/Power-supplies/powersup.htm