This is a very nice Audio Research D-76a tube amplifier. It is 75 watts per channel and the Serial number is 579150-5. This is an 'as is sale' with no return accepted. I guarantee that when I plugged it in it lit up and the tubes all seemed to be OK (as in lit up). I don't know if this unit is one we originally sold or what the story is behind it. We were an Audio Research dealer for many years and I will be listing and offering for sale several items. The pictures I took were of the unit as you can see the Serial number. There is no original box but the unit is packed well and will be double boxed.