This is probably a dumb question, but looking at front panel shots of the Aguilar DB-659 preamp, I don't see an on/off switch. I haven't been able to find a photo of the rear, and the one I played in a music store was rack mounted and I couldn't see the rear panel. Is there a switch on the rear? Does anyone have a photo of the rear panel of that preamp? It seems that not having a power switch on the front panel would be pretty inconvenient.