Seventh Circle Audio

Hi - I built my rack (2xN72's, 4xA12's and 2xJ99's) in the fall of 97. I had a heck of a time reducing hum and finally got it down to an acceptable level.

Now I see a new PSU has been released to supposedly fix some of those issues. I am also going to be moving to Europe and I'm not sure if PS02 works with 220V or not.

Does anyone know? Is it possible to trade in the PS02 for a PS03? Would the PS03 solve the humming issues?

Thanks,

Roberto

I built my rack (2xN72's, 4xA12's and 2xJ99's) in the fall of 97. I had a heck of a time reducing hum and finally got it down to an acceptable level.

You must mean the fall of 2007?

Now I see a new PSU has been released to supposedly fix some of those issues. I am also going to be moving to Europe and I'm not sure if PS02 works with 220V or not.

You probably have a PS03, not a PS02. Does it have 3 status LEDs along the top of the board? If so, it's a PS03 and will work with 220V with no modification required. Just plug it in to a 220V outlet and it will work.

Is it possible to trade in the PS02 for a PS03?

Yes. E-mail sales@seventhcircleaudio.com for details.

Would the PS03 solve the humming issues?

If you have a PS02 and if the +30v output is sagging under load, then a PS03 will make a difference. If the hum is loud in the N72s but not in the A12s then swapping the supply may fix it, but I suspect any problems you're having are due to some other cause.

yeah, sorry, I meant 2007, time flies when you're having fun

I'll check on the LED's. The hum was resolved by changing the "grounding" jumpers on the N72's.

Thanks for the great support,

Roberto