I had given one of my children a system some years back that had three Denon units, amplifier/tuner, cassette unit, cd changer and some Mission speakers. For what it is it is very good and he is still using it.
unless i am missing something , but you provide no model number for any of the equipment
since your son still has it , why not have him give you the model numbers of the equipment you are interested in and YOU look the equipment up?