This was mistakenly advertised as a Karaoke machine. It isn’t a Karaoke machine. Nevertheless I took a punt on buying it as I had the feeling that I owned the unusual cartridges it plays. In this video you can see if my hunch paid off and learn more about a rare format through an even rarer player.

My earlier video about this format https://youtu.be/Q_9IBIcsYj4

UPDATES:
I) The machine appears to date from approx 1976. A helpful person on Patron spotted a date code on the speaker. 
II) Crown? Weren’t they a US/U.K. brand? (delete as applicable) - not this Crown https://commons.wikimedia.org/wiki/Category:Crown_(audio_brand)

00:00 Start
00:40 The machine
02:16 HiPac?
07:37 What did it do?
10:31 How did it work?
12:48 The 50/60Hz issue
15:44 A look inside
22:20 Cart player mech
26:22 Blather
28:20 A load of carts
30:10 Inside a cart
31:51 Internal speaker
32:45 Blank carts & recording
37:03 Summary
38:43 Patreon credits


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Regularly asked question 
Q) Why are there comments from days ago when this video has just gone live today?
A) Patrons https://www.patreon.com/techmoan usually have early access to videos. I'll show the first version of a video on Patreon and often the feedback I get results in a video going through further revisions to improve it.  e.g. Fix audio issues, clarify points, add extra footage or cut extraneous things out. The video that goes live on youtube is the final version.