Yep. That's a famous 8600 series single-ended amp. The ultimate upgrade thread for you is here, and the very useful table of contents is here.
Several of us here are intimately familiar with this design, so let us know what you want to do with it.
Original Sams service literature (on several representative varieties) is attached below.
Several of us here are intimately familiar with this design, so let us know what you want to do with it.
Original Sams service literature (on several representative varieties) is attached below.


