Note
Only MR/JR model photo known shows a rectangular cartridge loop.
This reel based endless loop may have been a production product.
The aluminum rectangular compartment seems to be for holding the excess tape.
As the tape is pulled out from the endless playback spool the reel pulls in the tape from the aluminum box.
The tape is pushed against the playback head by pushing the guide towards the playback head, to release this, pull the spring loaded bar out.
Has a speaker out connector and volume adjust.
No other photos of this machine (with the reel) are known to exist.
