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Archive: https://archive.today/Jicsr

From the post:

>Before YouTube, you had to watch your educational videos on film. In the 1970s, if you studied radio, you might have seen the video from Universal Education and Visual Arts, titled Understanding Electronics Basic Radio Circuitry. The video’s been restored, and it appears on the [CHAP] YouTube channel. The video starts with a good history lesson that even covers Fessenden, which you rarely hear about. The video is full of old components that you may or may not remember, depending on your age. There’s a classic crystal radio at the start and it quickly moves to active receivers. There’s probably nothing in here you don’t already know. On the other hand, radios work about the same today as they did in the 1970s, unless you count software-defined varieties.

Archive: https://archive.today/Jicsr From the post: >>Before YouTube, you had to watch your educational videos on film. In the 1970s, if you studied radio, you might have seen the video from Universal Education and Visual Arts, titled Understanding Electronics Basic Radio Circuitry. The video’s been restored, and it appears on the [CHAP] YouTube channel. The video starts with a good history lesson that even covers Fessenden, which you rarely hear about. The video is full of old components that you may or may not remember, depending on your age. There’s a classic crystal radio at the start and it quickly moves to active receivers. There’s probably nothing in here you don’t already know. On the other hand, radios work about the same today as they did in the 1970s, unless you count software-defined varieties.

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That's interesting that they were still so in-depth teaching tubes in 1971, especially with the knowledge that they were most certainly on their way out.

Then again, that's the easiest way to show stages in a radio, you can see the tubes light and easily troubleshoot stages down. Odd that there's a 50L6GT in the power amp stage while all the rest are standard AA5 minis on the big breadboard demo. But still, transistors were going to be the thing and they even knew it in 1971.

Here's a single tube radio like the one in some of the demos: http://www.netzener.net/index.php/project-articles/10-one-tube-am-radio - it uses the tube to both detect the audio and amplify it. For a better experience, check out the single-transistor regen-reflex radios that China developed back in the 60s. (unfortunately most of the sources the link gives are now dead, but it's still a good read for radio stuff.)