Two GEC KT88 rolling about loose, sleeve needs rebuilding, the strips inside are split and need replacing. Packing won’t help this sort of thing, been cropped, ropes around the box for handling might have helped.
Guts look alright, but the wiring style looks different to the other 200w Sound City I had earlier, curves in this rather than vague attempts at angles.
Big iron. Second preamp valve from the left in the pic is an ECC81.