Many thanks to SWLing Post contributor, Pete Eaton, who shares the following vintage industry short film:
Click here to view on YouTube.
Like Pete, I’m impressed with the size of those soldering irons!
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Failure rate of 15% is very high.
Here is an interview with one of the engineers who designec the TR-1.
Interesting how the failure rate at the factory was 15%:
https://ethw.org/Oral-History:Richard_Koch