By the time the 33 preamp was replaced by the 34 preamp, CD players were commonplace, so it had a dedicated CD input, and will therefore be fine with your Marantz. (Before then, the high 2 volt output could overload the 33 Model, so many folks had them modified or fitted attenuators).
I believe earlier 34s had DIN inputs, whereas later ones had RCA phono sockets. If you have the former you’ll need a two phono to 5 pin DIN adapter.