I recently came into possession of some bass equipment and I'm trying to find out some info about it. The piece in question is a Trace Elliot GP7. I can't seem to really find anything on it other than the specs are said to be the same as the GP12 aside from the equalization. Model No. AH1305 Serial No. T620/0679. It's in good working order. Pots are a little scratchy. From what I understand the last digits in the serial indicate the year manufactured. That being the case, a slight scratch in the pots for an preamp made in 79 is ok by me.