hi there! I live in Sweden and wonder where I can get my SF-2 repaired? Just before an imortant gig power in it went and now it?s stone dead (exept for the front lamp that?s lit). I just can?t live without it = only effect I?ll ever want/need! Pix from our gig at www.flickr.com/photos/ankhljufer. I?m grateful for any advice. best regards from a frosty sweden

Usually, this is a problem from using the incorrect polarity on the transformer. There is an illustration printed near the connector to remind you to always use one with a center positive and the voltage range is from 10.5-17VDC.  
 
To test if the choke has failed, use a voltmeter to ground, and you should see the same reading on both sides of the choke (ie 16V on both sides).
 
Here's where to find it:
 

 
It looks like a resistor, but it is a 47mH choke. If you can't find that exact part, you can use a 1/10 watt fuse instead (never exceed 1/2 watt).  
 
Or, if you are really brave, and need it functioning in a hurry, you can use just a wire, but understand that the choke protects the rest of the unit if the polarity if wrong. If you eliminate the choke, a more expensive repair will be in your future if the same thing happens again.

hi and 1000 thanx for your promt reply!now my technician can fix it quickly. i just can?t do without it. it?s the best thing that has happened to my basssound (well, having to epics is nice too!), thanks from sweden.

all is well in the albrecht-house! the sf2 has a new choke. micas information was vital for speedy service by my tech. exellent!!! i?m happy!!!!!

Cool!!
 
I've found that it is a good idea to mark wall warts with a Sharpie.  I fried a perfectly good answering machine when I plugged in the wrong wall wart.