That 65 is possibly something that belongs to Tandbergs first language laboratory, along with the Model 10. The 5000 is the student deck for the IS6 language laboratory and is a three-motor, two-track, three-head simultaneous record/playback design unless some special or "un-talked about" editions were made, which is quite possible. Tandberg made a lot of things to order. What the picture doesn't show is the tape transport control panel that enabled the students to operate the deck. The tapes were equipped with a piece of metal foil on the ends that activated an end stop function so it was impossible to run the tape off the reels. The deck itself was out of reach from the students. After all, the big point of the language lab is that you can listen to recorded instructions and at the same time record yourself, so it wouldn't really serve it's purpose without recording capability. The teacher can remote-control all the decks from his/her desk, one of the main reasons for this is to be able to pre-record the desired education material on all the student recorders simultaneously, at the touch of one button. The model 65 may have been used as a (cheap) playback machine for this. Also worth mentioning, is that a cassette deck was offered for use with the IS6. It used the same cables and control equipment as the open reel recorders and was a direct replacement or upgrade.
I have some documentation for the IS6, and i can't find any reference to a playback-only unit. There are a "Teacher's deck" (Model 15-21) and a "Student's deck" (Model 5000). Included on the list is also the other necessary parts, like power supplies, control panels, tapes and furniture specially made for the equipment.
If anyone's interested, here are some prices (converted to US Dollars with today's exchange rate, and adjusted for inflation):
Model 5000 tape recorder: $1894.62
Model 15-21 tape recorder: $1352.03
Recording tape, 900 feet: $29.97
Headset with microphone: $189.07
Power supply: $993.33
Price quote for complete system, 30 students: $119,731.20