Recording video in the 1950s

[DrStrangelove]

I spent 3 years servicing N1500s in the 3M cassette tape QA test section.

Could never get the dropout tests to correlate properly for some reason.

At the time my weekly salary would have bought two VC60 cassettes.

For some reason there's an N1500, an N1502, and an N1700 upstairs.