Hello , my name is Jack Perhaps I can help you with this but first I must say that I`m sorry but somehow your earlier posts did not get through correctly.
To get back to your question;
There are two ways to connect this receiver to the reel to reel tape that you have ;
You can use either 2 pair of standard rca cables or a single 5 pins DIN cable also called MIDI cable.
You can get such a DIN cable at the link below;
There is no need to have both and neither has a real advantage over the other type except that the DIN is a single connector that will automatically connect the ins and outs correctly.
If you opt for the rca cables then you can get them at just about any stores that sells electronics or audio equipment , radio shack,bestbuy,walmart etc. for example.
Hope this help and I will be in standby if you have any questions.