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Forum Index : Microcontroller and PC projects : 1950’s TV assembly....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9754 |
1950's TV Assembly We have come a long way. Smoke makes things work. When the smoke gets out, it stops! |
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mikeb Senior Member  Joined: 10/04/2016 Location: AustraliaPosts: 177 |
Love the test for 'microphonics' of the valves.  At least they use corks to beat them with.  There are 10 kinds of people in the world. Those that understand binary and those that don't. |
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| noneyabussiness Guru  Joined: 31/07/2017 Location: AustraliaPosts: 527 |
Wow.. very interesting. . I wonder if that much " rigious " testing is done now days?? I think it works !! |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9754 |
I wondered about their sort-of 'Burn-in' test of the valves(tubes). While that is fine to do with modern stuff, even the most reliable valve would surely use up some of it's expected lifespan running that test on them? I guess they had to have quality-control, but I was quite surprised that there was THAT MUCH quality control back then. Smoke makes things work. When the smoke gets out, it stops! |
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| Hatrick Newbie  Joined: 16/11/2015 Location: AustraliaPosts: 6 |
Yes, the "burn-in" wouldn't have been too long, given the limited life of valves and picture tubes. I recall the days of valve TVs; the warranty on Australian-made B&W TVs was 3 months. Yes, 3 months! TV insurance was a big business back then, in case something failed after the warranty ran out. And usually did. To fix picture tubes which had dying electron emission, one could buy a small auto-transformer which fitted between the tube and the wiring socket, which cranked up the heater volts from a nominal 6.3vac to something higher in several steps; ie, as one step became ineffectual, one moved up to the next voltage step. Until the heater eventually karked it. Insurance companies were pretty evasive about replacing faulty picture tubes, which they reckoned were not dead enough. A trick I heard of was for the owner to zap the heater with 240v. This effectively made the tube very dead, and insurance was then paid out.  Gerry |
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| BrianP Senior Member Joined: 30/03/2017 Location: AustraliaPosts: 292 |
One of the most noticeable points to me is the complete lack of protective clothing / breathing gear in some of those environments. A bit different nowadays  B |
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