A buddy of mine picked this amp up and we cannot find out who made it. I found a model number on the board and it says PSL 745 .Which I'm guessing means 75 watts x 4 @ 4 ohms, But I cannot figure out the PSL part. It looks to me to be older and to be pretty well built. I like the gain knobs and board looks pretty beefy and done right. I just cant find a manufacture name. I looked up Phase Linear, Pyle, Profile, Phoenix gold, Pyramid, and a few others that started with a P and have found nothing that looks like this. Anymore info will be appreciated.