TEAC pre's sound really nice in my opinion. It's a solid state unit but should be very useful for some applications.
The 1/4" inputs are mic inputs (low impedence...150 ohms to 600 ohms). Check the specs. So you can plug any dynamic mic into those jacks or a passive DI box will convert a high impedence signal like an electric guitar, modern mic pre. processor, keyboard, etc. to a proper impedence level for that input. Just be aware of the mount of voltage (volume) you're sending to the DI box.
You can also use the RCA inputs for your high impedence devices like processors, keyboards, modern mic pre's, etc.. Some people ask: why would you run a modern condenser mic from a modern mic pre into an old tape deck like that? The answer is simple: Just listen to the dimension it creates. Listen to how the older electronics thicken up and focus the signal and give it such a nostalgic quality and color. Plus, it's just one more interesting tool to have to work with.
The RCA outs you just connect to your DAW.