I have an Audiolab tuner that I have not used in 10 years, like new if you are interested.
I would throw away the cassette stuff. There is no market for it.
There are much better amps out there now, but you will need serious power for the Ohm speakers. I suggest switching amps, like the Merrill Audio.
Get rid of the preamp, it will hold back the entire system. Try to do without one or use a passive transformer-based one. A good active Pre is vacuum-tube based and expensive, like $10K. Maybe look at Prima Luna stuff.
Finally, if you want to modernize to improve sound quality, get a good DAC, maybe with volume control and a reclocker to reduce the jitter of your transport. If the CD transport does not have digital output, get rid of it and get a good used or new Oppo Blu-ray player on ebay.