First view of the insides. The large blue cylinders on the left are 490uF 85V Sprague Capacitors (Made In USA).
In the second image, I highlight a few parts. The items in the blue box are some odd can diodes, on top in the red box is a fully replaceable board on a standoff, the seafoam green is the main power transformer (17 taps) and hiding under the ribbon at the yellow box are the pass transistors.
I hesitate saying this because of those horrible gold scavengers but it appears all of the traces on the board all gold plated. Even 40 years later it beautifully shiny.