Getting nice warm here in Auckland New Zealand Day 24°C Night 18°C Humidity 70%

Talking tape formats. Sony had in the 70's also a format called "Elcassette" which used ¼ inch tape in a cassette and ran at 9.5 cm/sec like the reel to reel machines.
The cassette was about the size of a Beta cassette but thinner.

I still use reel to reel to copy cd's on for long mixture of music on 26.5 cm reels with autoreverse, I do admit that I like to see the reels turning around. instead of a disc which disappears in a slot, new tapes I get on Ebay for quite good prices. [Linked Image]

The product of rotation, excitation and flux produces electricty.