Reel To Reel Connection Question

Yes, you can use your deck's output into a preamp or receiver CD input. You'll need a tape output on your receiver to make recording practical, but I'm not sure what the value of that would be.

What is your interest in reel-to-reel?

Reel2Reel is a waste of time. I've used it since1964 and unless you are playing back $500 master copies it is a degrading format. You can make much better recordings  cheaper with DSD now if that's your goal. I only use mine for playing 4 channel masters.
I could not live without 2 tape monitor channels and a dBx 400 switchbox.

It is dependent if the RtR has an onboard preamp or NOT. It is just like a turntable you have to have a tape preamp.. MOST modern Reel to Reels had EQs on board. THE Great ones had onboard bypass too. You could play directly from the head through a tweaked tape/phono stage... Not much better in the way of playback...

RtR is cool to mess with... I'm actually waiting on just such a device.. Direct head playback Tape/phono (valve) preamp.. 5 months 3 weeks now.. TWO months to go... Decware ZP3...

Remember, HiFi, you may not be able to appreciate RtR without a few mods... An AV(HT) may work, but it might not be a good starting point...
Tinker point maybe... Fun for sure....

Enjoy...