I have never seen the Ortofon half speed.
In which country was this version released?
Scandinavia. Pressed on Polar.
Deeper grooves than the German pressing.
As far as the discrete quad version - the only place I ever seen it is on a two-cassette JVC discrete quad with ANRS noise reduction.
The guy I knew that had the only copy I'd ever seen passed away and instead of calling people or going online to tell guys to come get his things - his mother threw out all his ``crap'' that she was forever tripping over in``her'' house - and presumably that was among them.
Both tapes had a ``button'' over the reel hubs so that a user could only install the cassette in the player face up.
Don't remember though if this was
A) 4-track portastudio track configuration (equidistant tracks),
B) 4-track musicassette track configuration (inequal distance with the large guardband down the middle so that if you played it on a normal cassette player the azimuth would like up with the front channels forwards and the rear channels backwards) or
One thing I DO know is that it was NOT the JVC 8-channel format that used musicassette track configuration that split the 4 tracks into 8 to where the left front and left rear would combine for left and the same for right and have 2 sides like a normal cassette.
Otherwise why would they need 2 cassettes for?
Although from asking various long in the tooth quadraphiles - I get the impression this was like the
5th of Beethoven Q8 - made as a test or demo product to show off the player in the field - maybe to get funding to bring it to production.
But since AFAIK that JVC player never MADE it to production or if it did there can't have been more than a couple hundred made - it leaves one to wonder.....