Please be gentle....

https://www.youtube.com/watch?v=sGiOx-NAE7A
Hi, thanks for asking folks on A'gon for help. Although gentle is not always the watch word on this site, there are lots of folks here who have plenty of audio expertise. Unfortunately it might not cover the Sharp brand. Nevertheless, I suggest you view the youtube link I have pasted above and then answer the question whether yours looks similar to it. That might get you more traction in knowing what you have and what you don't.

catinwa ...

I found this:

https://www.radiomuseum.org/r/sharp_rdn_709rdn70.html

These aren’t worth much in today’s market. Good in their day though. You would need pre-recorded 4-track reel to reel tapes to play, With that thought in mind, dig around to see if your friend has any tapes. Some of them could bring good money on eBay. In fact, if you find tapes, you might want to consider selling the unit and tapes as a bundle on eBay. Put it up for auction and see what happens.

Check out the prices of 4-track tapes here:

https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311.R8.TR10.TRC0.A0.H0.Xreel+t...

Hope its helpful to you.

Frank

Thank you for the replies so far. As far as my model goes, it looks similiar to the 708 model but there are some variances. First, my model has a 3 motor automatic reverse system. I don't know what the 708 has, even after the video, but mine says it right on the front. I do know from the little bit I have found out, is that the 3 motors and the auto reverse are a good thing vs a single motor. The second difference, don't know if it matters, is the mode selector. On mine, it has mode 2.3, 1.4, stereo, and mix. I will reiterate, I do not even know what that means. It could be written in the most obscure Belarusian language for all I understand🤔.  Speed selection gives three options, 1) 1 7/8 I.p.s, 2) 3 3/4 and 3) 7 1/2 I.p.s. The other difference is that the two speakers are not a part of the recording unit. In fact, they attach by facing each other and clasp together via a hinge lock.  This unit also has, a seperate bag containing  2 microphones that plug into the recording unit. If I have missed something in this description, please advise. The other thing that might, or might not matter us that there are reels of some kind of recording that is ready to play. The reels are both 7". 

I would gladly insert a picture or three but it doesnt appear that that is an option. Once again, I sincerely thank everyone for your input, useful, or not. Every little bit helps in my quest for knowledge about this contraption.

Warm Regatds,

Cat

BTW Frank, very helpful information from the museum. I suppose knowing where to look is helpful. Many thanks!