Power Supply Problem

[craigmorris74]

I had a +-15V Power One power supply laying around that I wanted to use to power a couple of API type preamps.  I hooked everything up and it was only putting out +-12.5 volts.  I thought something must be wrong with it, so I got another cheap one off Ebay.  I put it in the case and only got about +-13.5V on this one.  I could adjust it down to +-9V.  Are these just bad supplies or am I doing something I'm doing wrong here?

Thanks,

Craig

 

[joaquins]

what is the current rating of those supplys and how many pres you are using with them?

JS

 

[craigmorris74]

This one is .8A I think.  But my measurements are without a load.

 

[joaquins]

I dont know exactly wich is your model but one in ebay have a inscription on it "for ±15V cut jumpers VW1 y VW2"

Maybe yours has something similar... look it.

JS

 

[craigmorris74]

Joaquin-you could be my hero.  My supply is jumpered there.  I'll check it out tomorrow after work.  Thanks for the tip!

 

[craigmorris74]

That was it.  Since it's labeled as a 15V supply, I never considered it would come jumpered for 12V. 

Thanks again for your help, Joaquin.

 

[joaquins]

It was nothing... Good luck with your preamps!

JS