I am restoring a Kenwood KA-7300 where someone attempted a restoration and botched it. I have a second KA-7300 that has not been restored or worked on, but has a damaged chassis. After generating a parts list for the Tone Control assy from the second unit that is original, I discovered that both KA-7300 units have different Tone Control assys. They share the same component references but I see that some of the values for film caps that share the same reference has different values. Has anyone encountered this issue? Is there an addendum to the Kenwood KA-7300 manual that might show a Tone Control udpated/version schematic change?????