Further information: I have tested everything the best I can and it is all working and sounds great.
Please note that I do not have great connecter cables, just cheap ones you might buy at the Reject Shop, and I only have some old figure 8 for testing the speakers.
I cannot test the cassette player properly, as I have no cassettes.
Also, I have no laserdiscs to test the laserdisc player, but CDs work fine.
I also have a Yamaha CDC 635x which plays CDs, but the drive band which opens the drawer has perished. That is not included in the price.